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1937 in science
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==Technology== * February β [[Hans von Ohain]] begins ground-testing a [[turbojet]] engine. * April 12 β [[Frank Whittle]] ground-tests the first [[jet engine]] designed to power an aircraft, at [[Rugby, Warwickshire|Rugby, England]]. * May 28 β [[Rocker Shovel Loader]] patent applied for in the United States. * June 5 β [[Alan Blumlein]] is granted a [[patent]] for an [[ultra-linear]] amplifier.<ref>{{cite patent|GB|496883|title=Improvements in or relating to thermionic valve amplifying circuits}}</ref> * December 13 β Tomlinson Moseley files the first patent for an [[electric toothbrush]].<ref>{{cite web|title=Electric toothbrush|url=https://patents.google.com/patent/US2196667A/en|website=Google Patents|access-date=2024-08-26|date=1937-12-13}}</ref> * [[Alec Reeves]] invents [[pulse-code modulation]].
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