Invention
|
Inventor
|
Aeroplane
|
Wright brothers
|
Air Brake
|
George Westinghouse
|
Air Pump
|
Otto von Guericke
|
Airship (rigid)
|
G. Ferdinand Von Zeppelin
|
Aniline Dyes
|
Hoffman
|
Antiseptic Surgery
|
Lord Joseph Lister
|
Arc Lamp
|
C. F. Brush
|
Archimedean Screw
|
Archimedies
|
Atom
|
Neils Bohr
|
Atomic Number
|
Mosley
|
Atomic Physics
|
Enrico Fermi
|
Atomic Structure
|
Bohr and Rutherford
|
Atomic Theory
|
Dalton
|
Automatic gearbox
|
Hermann Fottinger
|
Automobile
|
Daimler
|
Automobiles using gasoline
|
Karl Benz
|
Avogadro’s Hypothesis
|
Avogadro
|
Bacteriology
|
Robert Koch
|
Bacteriophage
|
Max Delbruck
|
Bakelite
|
Leo H Baekeland
|
Balloon
|
Jacques and Joseph Montgolfier
|
Ball-Point Pen
|
John J. Loud
|
Barometer
|
Evangelista Torricelli
|
Behaviorism
|
B. F. Skinner
|
Beri – Beri
|
Eijkman
|
Bicycle
|
Kirkpatrick Macmillan
|
Bicycle Tyre
|
J.B. Dunlop
|
Bifocal Lens
|
Benjamin Franklin
|
Binomial Nomenclature
|
Carl Linnaeus
|
Biogenetic Principle
|
Ernst Haeckel
|
Bismuth
|
Valentine
|
Blood Circulation
|
Harvey
|
Blood Groups
|
Karl Landsteiner
|
Bomb
|
Edward Teller
|
Boson
|
S.N.Bose
|
Boyle’s law
|
Boyle
|
Braille
|
Louis Braille
|
Breaking up the Nucleus of an atom
|
Rutherford
|
Calculating machine
|
Pascal
|
Camera
|
George Eastman
|
Carburetor
|
Gottlieb Daimler
|
Carburettor
|
Gottlieb Daimler
|
Cash register
|
William Burroughs
|
Cell Doctrine
|
Rudolf Virchow
|
Celluloid
|
A.Parker
|
Cement
|
Joseph Aspdin
|
Cenema
|
A.L. and J.L. Lumiere
|
Centrigrade scale
|
A. Celsius
|
Chemical Structure
|
August Kekule
|
Chemotherapy
|
Paul Ehrlich
|
Child Development
|
Jean Piaget
|
Chloroform
|
James Harrison and James Young Simpson
|
Cholera Bacillus
|
Robert Koch
|
Chromosomal Theory of Heredity
|
Thomas Hunt Morgan
|
Chronometer
|
John Harrison
|
Cine camera
|
Friese-Greene
|
Cinematograph
|
Thomas Alva Edison
|
Cinematography
|
Thomas Alva Edison
|
Circulation of the Blood
|
William Harvey
|
Classical Field Theory
|
Michael Faraday
|
Clock (machanical)
|
Hsing and Ling-Tsan
|
Clock (pendulum)
|
C. Hugyens
|
Coloured Photography
|
Lippman
|
Computer
|
Charles Babbage
|
Continental Drift
|
Alfred Wegener
|
Cosmic Rays
|
R.A.Millikan
|
Crescograph
|
J.C.Bose
|
Crystal Dynamics
|
C.V.Raman
|
Cyclotron
|
Lawrence
|
D.D.T.
|
Dr.Paul Muller
|
Deciphering the genetic code
|
Dr.Hargobiad Khorana
|
Deuterium (Heavy Water)
|
H.C.Urey
|
Diesel Engine
|
Rudolf Diesel
|
Diesel Oil Engine
|
Rudolf Diesel
|
Difference engine
|
Charles Babbage
|
Electrons
|
J.J.Thomson
|
Laws of Planetary Motion
|
Kepler
|
North Pole
|
Robert Peary (1909)
|
Solar System
|
Copernicus (1540)
|
South Pole
|
Amundson (1912)
|
Specific Gravity
|
Archimedes
|
West Indies
|
Columbus (1492)
|
Drinker’s Chamber of Iron Lung
|
Dr.Philip Drinker
|
Dynamical theory of Heat
|
Lord Kelvin
|
Dynamite
|
Alfred B. Nobel
|
Dynamo
|
Michael Faraday
|
Effect of Pressure on trough bodies
|
Meghnad Saha
|
Eightfold Way
|
Murray Gell-Mann
|
Electric Battery
|
Alessandro Volta
|
Electric Flat Iron
|
H. W. Seeley
|
Electric Furnace
|
William Siemens
|
Electric Generator
|
Michael Faraday
|
electric guitar
|
Adolph Rickenbacker
|
Electric iron
|
H.W. Seeley
|
Electric Lamp
|
Thomas Alva Edison
|
Electric Measurement
|
Gauss
|
Electric Motor (AC)
|
Nikola Tesla
|
Electric razor
|
Jacob Schick
|
Electrical Waves
|
Heitz
|
Electricity
|
Faraday
|
Electromagnet
|
William Sturgeon
|
Electromagnetic Field
|
James Clerk Maxwell
|
Electromagnetic Theory
|
Maxwell
|
Electron
|
Joseph J. Thomson
|
Electron Theory
|
Bohr
|
Electronic Computer
|
Dr. Alan M. Turing
|
Elevator
|
Elisha G. Otis
|
Energy of the Sun
|
Hans Bethe
|
Equal sign (=)?
|
Robert Recorde
|
Ethology
|
Konrad Lorenz
|
Eugenics
|
Francis Galton
|
Evolution
|
Charles Darwin
|
Evolution (theory)
|
Charles Darwin
|
Evolutionary Theory
|
Ernst Mayr
|
Fahrenheit Scale
|
Fahrenheit
|
Film & Photographic goods
|
Kodak
|
Film (with sound)
|
Dr. Lee de Forest
|
Foundations of Biology
|
Jean Baptiste Lamarck
|
Foundations of Mathematics
|
Euclid
|
Founding of Modern Physiology
|
Claude Bernard
|
Founding of Psychology
|
Wilhelm Wundt
|
Fountain Pen
|
Lewis E. Waterman
|
Fundamental Laws of Electric Attraction
|
Coulomb
|
Galvanometer
|
Andre-Marie Ampere
|
Gas lighting
|
William Murdoch
|
Gasoline engine
|
Karl Benz
|
Genetic Code
|
Frederick Sanger
|
Geometry
|
Euclid
|
Germ Theory of Disease
|
Louis Pasteur
|
Glider
|
Sir George Caley
|
Gramophone
|
Thomas Alva Edison
|
Gun powder
|
Rogei Bacon
|
Heavens
|
William Herschel
|
Heavy Hydrogen
|
Urey
|
Helicopter
|
Broquett
|
Heliocentric Universe
|
Nicolaus Copernicus
|
Helium Gas
|
Lockyer
|
Homoeopathy
|
Hahnemann
|
Hovercraft
|
Christopher Cockerell
|
Human Sexuality
|
Alfred Kinsey
|
Hydrogen
|
Cavendish
|
Hydrophobia
|
Louis Pasteur
|
I.Q. Test
|
Alfred Binet
|
In Number Theory
|
Ramanujam
|
Incandescent Bulb
|
Edison
|
Induction Coil
|
Rohm Korff
|
Induction of Electric Current
|
Faraday
|
Insulin
|
F.Banting
|
Intelligence test
|
Binet
|
Internal Combustion Engine
|
Otto
|
Jeans
|
Levi Strauss
|
Jet Engine
|
Sir Frank Whittle
|
Jet Propulsion
|
Frank Whittle
|
Kala-azar Fever
|
U.N.Brahmachari
|
Kaleidoscope
|
David Brewster
|
Laboratory Gas Burner
|
Robert Wilhelm Von Bunsen
|
Laughing Gas
|
Priestley
|
Law of Electrolysis
|
Faraday
|
Law of gases
|
Gay Lussac
|
Laws of Electrical Resistance
|
Ohm
|
Laws of Gravitation
|
Newton
|
Laws of Heredity
|
Gregory Mandel
|
Laws of Inheritance
|
Gregor Mendel
|
Laws of Motion
|
Newton
|
Laws of Multiple Proportion
|
Dalton
|
Laws of Natural Selections
|
Darwin
|
Life Boat
|
Henry Great Head
|
Lift
|
E.G. Otis
|
Lift (Elevators)
|
Otis
|
Lightning Conductor
|
Benjamin Franklin
|
Line of demarcation (ship)
|
Plimsoll
|
Linotype
|
Mergenthaler
|
Liquid Oxygen
|
Dewar
|
Locomotive
|
Richard Trevithick
|
Logarithmic Tables
|
John Napier
|
Logarithms
|
John Napier
|
Machine Gun
|
Dr. Richard Gatling
|
Malarial Parasite
|
Ronald Ross
|
Match (safety)
|
J.E. Lurdstrom
|
Mathematical Astro Physics
|
Chandrasekhar
|
Mathematical Genius
|
Carl Gauss (Karl Friedrich Gauss)
|
Mauve dye
|
Perkin
|
Measurement of Electrical Energy
|
Joule, James Prescoft
|
Mechanical Equivalent of Heat
|
Joules
|
Mercury Thermometer
|
Fahrenheit
|
Meson
|
Hideki Yakawa
|
Microphone
|
Johann Phillip Reis, Alexander Graham Bell, Elisha Gray, Amos E.
Dolbear, and Thomas Edison
|
Microscopic Anatomy
|
Marcello Malpighi
|
Modern Anthropology
|
Franz Boas
|
Modern Astronomy
|
Arthur Eddington
|
Modern Computer
|
John von Neumann
|
Modern Geology
|
Charles Lyell
|
Modern Physiology
|
William Bayliss
|
Modern Synthesis
|
Theodosius Dobzhansky
|
Modern Telescope
|
Edwin Hubble
|
Molecular Biology
|
Francis Crick
|
Molecular Scattering of light in fluid
|
Ramanathan
|
Montessori Method
|
Maria Montessori
|
Motion of the Planets
|
Johannes Kepler
|
Motor Car (petrol)
|
Karl Butler
|
Movie Projector
|
Thomas Alva Edison
|
Neon Gas
|
Ramsay, Travers
|
Neon-lamp
|
G. Claude
|
Neurophysiology
|
Charles Sherrington
|
Neutron
|
Chadwick
|
New Anatomy
|
Andreas Vesalius
|
New Astronomy
|
Tycho Brahe
|
New Science
|
Galileo Galilei
|
Newtonian Mechanics
|
Pierre Simon de Laplace
|
Newtonian Revolution
|
Isaac Newton
|
Nuclear Fission
|
Otto Hahn, Bohr and Fermi
|
Nylon
|
Dr. Wallace H. Carothers
|
Nylon Plastic
|
Carothers
|
Organic Chemistry
|
Emil Fischer
|
Origin of Species
|
Charles Darwin
|
Oxygen
|
Priestly
|
Paints
|
Shalimar
|
Paper clip
|
Johann Vaaler
|
Parking meter
|
Carlton Mcgee
|
Penicillin
|
Alexander Fleming
|
Periodic Law
|
Mendeleef
|
Periodic Table of Elements
|
Dmitri Mendeleev
|
Pharmacology
|
Gertrude Belle Elion
|
Phonograph
|
Edison
|
Photograph
|
Dauguerre
|
Photography (paper)
|
W.H. Fox Tablot
|
Phototherapy
|
N.R.Finsen
|
Pneumatic Tyres
|
John Boyd Dunlop
|
Positive Electrons
|
Anderson
|
Power Loom
|
Edmund Cartwright
|
Powerloom
|
Cartwright
|
Principle for lever (S.P.Gravity)
|
Archimedes
|
Printing for the Blind
|
Braille
|
Printing Press
|
Johannes Gutenberg
|
Psycho-analysis
|
Dr.Sigmund Freud
|
Psychology of the Unconscious
|
Sigmund Freud
|
Quanta
|
Max Planck
|
Quantum Cosmology
|
Stephen Hawking
|
Quantum Electrodynamics
|
Richard Feynman
|
Quantum Mechanics
|
Max Born
|
Quantum Theory
|
Werner Heisenberg
|
Quantum Theory
|
Max plank
|
Raazor (safety)
|
K.G. Gillete
|
Rabies Vaccine
|
Louis Pasteur
|
Radar
|
Dr. A.H. Taylor and L.C. Young
|
Radio
|
G. Marconi
|
Radio transmitter
|
Alexanderson
|
Radioactive Dating
|
Willard Libby
|
Radioactivity
|
Marie Curie
|
Radio-activity of Uranium
|
Henry Becquerel
|
Radium
|
Madame Curie
|
Railway Engine
|
Stephenson
|
Raincoat
|
Charles Macintosh
|
Raman effect
|
C.V.Raman
|
Rare Gas
|
Cavandish
|
Rayon
|
American Viscose Co.
|
Razor (electric)
|
Col. J. Schick
|
Refrigerator
|
James Harrison, Alexander Catlin
|
Replacing human heart
|
Christian Barnard
|
Revolution in Chemistry
|
Antoine Laurent Lavoisier
|
Revolver
|
Samuel Colt
|
Rise of German Science
|
Hermann von Helmholtz
|
rubber (vulcanized)
|
Charles Goodyear
|
Rubber (waterproof)
|
Charles Macintosh
|
Safety lamp
|
Sir Humphrey Davy
|
Safety Pin
|
William Hurst
|
Safety Razor
|
King C. Gillette
|
Salk Vaccine
|
Salk
|
Saxophone
|
Antoine Joseph Sax
|
Scientific astronomy
|
Hippalus
|
Scientific Thinking
|
Lucretius
|
Scooter
|
G. Bradshaw
|
Seismograph
|
Roberts Mallet
|
Sewing Machine
|
Thomas Saint
|
Sextant
|
Hadley
|
Ship (steam)
|
J.C. Perier
|
Ship (turbine)
|
Sir Charles Parsons
|
Shorthand
|
Sir Isaac Pitman
|
Sociobiology
|
Edward O. Wilson
|
Soviet Genetics
|
Trofim Lysenko
|
Space flying
|
Braun, Dr.Wernher Von
|
Spectroscope
|
Bunsen
|
Spectroscopy
|
Gustav Kirchhoff
|
Spinning frame
|
Sir Richard Arkwight
|
Spinning jenny
|
James Hargreaves
|
Stainless Steel
|
Harry Brearley
|
Steam boat
|
Fulton
|
Steam Engine
|
James Watt
|
Steam engine (condenser)
|
James Watt
|
Steam engine (piston)
|
Thomas Newcome
|
Steam Turbine
|
Parsons
|
Steel Melting Process
|
Bessemer
|
Steel production
|
Henry Bessemer
|
Stethoscope
|
Dr. William Stokes, Rene Laennec
|
Stress Concept
|
Hans Selye
|
Structural Anthropology
|
Claude Levi-Strauss
|
Structure of DNA
|
James Watson
|
Structure of the Atom
|
Ernest Rutherford
|
Submarine
|
David Bushnell
|
Sulpha Drugs
|
Domagk
|
Superconductivity
|
Heike Kamerlingh
|
Symbiosis Theory
|
Lynn Margulis
|
Symbol (x)?
|
William Oughtred
|
T.N.T.
|
llly Brandt
|
Talkies
|
Lee-de-Frost
|
Tank
|
Sir Ernest Swington
|
Telegraph
|
Samuel Morse
|
Telegraphic Code
|
Samuel Morse
|
Telephone
|
Sir Alexander Graham Bell
|
Telescope
|
Galileo
|
Television
|
Baird
|
Television (mechanical)
|
John Logie Baird
|
Tempo of Evolution
|
George Gaylord Simpson
|
Terylene
|
J. Whinfield and H. Dickson
|
The long playing microgroove record
|
Peter Goldmark
|
Theory of conditioned reflex
|
Pavlov
|
Theory of Evolution
|
Darwin
|
Theory of Relativity
|
Einstein
|
Theory of the Atom
|
John Dalton
|
Thermodynamics
|
Ludwig Boltzmann
|
Thermometer
|
Galileo Gallei
|
Thermos Flasks
|
Dewar
|
Tractor
|
J. Froelich
|
Transformer
|
Michael Faraday
|
Transistor
|
Bardeen, Shockley, Brattain
|
Typewriter
|
C. Sholes
|
Uranium fusion
|
Oho Hahn
|
Uranus (Planet)
|
Herschel William
|
Vaccination
|
Edward Jenner
|
Valve of radio
|
Sir J.A. Fleming
|
Vitamins
|
Hopkins and Funk
|
Vitamin A
|
Elmer V. McCollum and M. Davis
|
Vitamin B
|
Elmer V. McCollum
|
Vitamin B1
|
Casimir Funk
|
Vitamin B2
|
D. T. Smith, E. G. Hendrick
|
Vitamin Niacin
|
Conrad Elvehjem
|
Vitamin Folic acid
|
Lucy Wills
|
Vitamin B6
|
Paul Gyorgy
|
Vitamin C
|
James Lind
|
Vitamin D
|
Edward Mellanby
|
Vitamin E
|
Herbert Evans and Katherine Bishop
|
Vulcanised Rubber
|
Charles Goodyear
|
Washing Soda
|
Lablanc
|
Watch
|
A.L. Breguet
|
Waterproof Rubber
|
Charles Macintosh
|
Wave Mechanics
|
Erwin Schrodinger
|
Wave Theory of Light
|
Christiaan Huygens
|
Wave/Particle Duality
|
Louis Victor de Broglie
|
Wireless Communication
|
Oliver Lodge
|
Wireless Telegraphy
|
Marcony
|
World Wide Web and Hypertext Markup Language
|
Tim Berners Lee
|
X – Rays
|
Roentgen
|
X-ray
|
Wilhelm Reontgen
|
X-ray Crystallography
|
Max von Laue
|
zerox machine
|
Chester Carlson
|
Zip fastener
|
W. L. Judson
|
Zipper
|
B. F. Goodrich
|
GK Question On Invention and their Inventor.
A father said to his son I was as old as you are at the present
- A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 38 years now, the son's age five years back was:
- A. 14 years
- B. 19 years
- C. 33 years
- D. 38 years
- Answer & Explanation:Suppose the son's current age is x years. Then, (38 - x) = x⇒ 2x = 38.⇒ x = 19.Son's age 5 years back (19 - 5) = 14 years
- Related Question:
- At present, the sum of ages of 4 people is 76. After 7 years, the ratio will be 7:6:5:8. Find out the present age of C?
- A. 12
- B. 11
- C. 17
- D. 13
- Answer : D ( 13 )
- In a class, there are 20 boys whose average age is decreased by 2 months, when one boy age 18 years is replaced by a new boy. The age of the new boy is
- A. 14 years 8 months
- B. 16 yews 4 months
- C. 15 years
- D. 17 years 10 months
- Answer : A ( 14 years 8 months )
- Jayesh is as much younger to Anil as he is older to Prashant. If the sum of the ages of Anil and Prashant is 48 years. What is the age of Jayesh?
- A. 20 years
- B. 24 years
- C. 30 years
- D. Cannot be determined
- Answer : B ( 24 years )
- Four years ago, the father’s age was three times the age of his son. The total of the ages of the father and the son after four years, will be 64 years. What is the father’s age at present?
- A. 32
- B. 33
- C. 36
- D. 38
- Answer : C ( 36 )
- A father's age is three times the sum of the ages of his two children, but 20 years hence his age will be equal to the sum of their ages. Then the father's age is
- A. 30 years
- B. 40 years
- C. 35 years
- D. 45 years
- Answer : A ( 30 years )
- The ratio of the ages of the father and the son at present is 7:1. After 4 years, the ratio will become 4:1. What is the sum of the present ages of the father and the son?
- A. 29 years
- B. 35 years
- C. 32 years
- D. None of these
- Answer : C ( 32 years )
- In a cricket 11, the average age of 11 players is 28 years. Out of these, the average ages of three groups of three players each are 25 years, 28 years and 30 years, respectively. If in these groups, the captain and the youngest player are not included and the captain is eleven years older than the youngest player, what is the age of the captain?
- A. 33 years
- B. 34 years
- C. 35 years
- D. 36 years
- Answer : C ( 35 years )
- The present ages of three persons in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).
- A. 8, 20, 28
- B. 16, 28, 36
- C. 20, 35, 45
- D. None of these
- Answer : B ( 16, 28, 36 )
- The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was
- A. 10
- B. 11
- C. 12
- D. 15
- Answer : C ( 12 )
- The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A?
- A. C is younger than A
- B. 6
- C. 12
- D. 24
- Answer : C ( 12 )
The speed of a boat when travelling downstream is 32 km/h, whereas
- The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?
- A. 27 km/h
- B. 29 km/h
- C. 31 km/h
- D. Cannot be determined
- Answer & Explanation:
Suppose the speed of boat in still water is x km/h and speed of stream is y km/h
Speed of boat in downstream = (x + y) km/h
x + y = 32 …(i)
Speed of boat in upstream = (x – y) km/h
x – y = 28 …(ii)
Add. Eqs. (i) and (ii),
we get
2x = 60 x = 30 km/h
- Related Question:
- In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
- A. 3 km/hr
- B. 5 km/hr
- C. 8 km/hr
- D. 9 km/hr
- Answer : C ( 8 km/hr )
- A boat running upstream takes 7 hours 48 minutes to cover a certain distance while it takes 4 hours to cover the same distance running downstream. What is the ratio between speed of the boat and the speed of water current respectively ?
- A. 37 : 14
- B. 41 : 16
- C. 52 : 18
- D. 59 : 19
- Answer : D ( 59 : 19 )
- A man rows a boat at 8 km upstream in 2 hours and 2 km downstream in 40 minutes. How long will he take to reach 7 km in still water?
- A. 2 hrs
- B. 4 hrs 15 min
- C. 6 hrs
- D. 7 hrs 40 min
- Answer : A ( 2 hrs )
- A man rows 40 km downstream and 22 km upstream taking 5 hours each time. What is the velocity of the current ?
- A. 1.8 km/h
- B. 1.9 km/h
- C. 2.3 km/h
- D. 2.7 km/h
- Answer : A ( 1.8 km/h )
- A boat takes 90 mins less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is
- A. 4
- B. 3
- C. 2.5
- D. 2
- Answer : D ( 2 )
- A boat goes 24 km upstream and 28 km downstream in 6 hrs. If it goes 30 km upstream and 21 km downstream in 6 hrs and 30 mins, find the speed of the steam.
- A. 10 km/hr
- B. 5 km/hr
- C. 4 km/hr
- D. 6 km/hr
- Answer : C ( 4 km/hr )
- At his usual rowing rate, Rahul can travel 12 miles downstream in a certain river in 6 hrs less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for this 24mile round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current in miles per hour?
- A. 7/3
- B. 4/3
- C. 5/3
- D. 8/3
- Answer : D ( 8/3 )
- A and B in boat B1 challenge C and D in boat B2 in a race of 50 km. A and B take turns to row the stretches of 6 km and A begins. C and D take turns to row an hour and C begins. A and C can each row 5 km/hr, B and D each can row only 5(1/2) km/hr. Which boat wins and by what time?
- A. B1 wins by 2 mins
- B. B2 wins by 1(7/11) mins
- C. Both reach the finishing spot together
- D. B1 wins by 5(4/11)
- Answer : B ( B2 wins by 1(7/11) mins )
- In a stream that is running at 2 km/hr, a man goes 10 km upstream and comes back to the starting point in 55 mins. Find the speed of the man in still water.
- A. 20 km/hr
- B. 22 km/hr
- C. 24 km/hr
- D. 28 km/hr
- Answer : B ( 22 km/hr )
- A boatman goes 2 km against the current of the stream in 1 hr and goes 1 km along the current in 10 mins. How long will he take to go 5 km in stationary water?
- A. 1 hr
- B. 1 hr 15 mins
- C. 1(1/2) hrs
- D. 40 mins
- Answer : B ( 1 hr 15 mins )
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