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What year was Phonograph invented and how?
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What year was Classification of Data for Libraries invented and how?
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What year was Rocket Engine invented and how?
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Which company is ahead in Revolver innovations?
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When and who invented the Slide Rule?
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Who invented the Launderette?
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Who invented the Photography (on film)?
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Which company is ahead in Tank (military) innovations?
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What year was Watch (self-winding) invented and how?
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Which company is ahead in Lathe innovations?
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What year was Airship (rigid) invented and how?
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Who invented the Photography (on paper)?
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What year was Cement invented and how?
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Who invented the Lightning Conductor?
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