Editing Timeline of historic inventions (section)

====1930s====
* '''1930:''' The [[Supersonic combusting ramjet]] — [[Frank Whittle]].{{Citation needed|date=May 2024}}
* '''1930:''' The [[Phase-contrast microscopy]] is invented by [[Frits Zernike]].
* '''1931:''' The [[electron microscope]] is invented by [[Ernst Ruska]].
* '''1933:''' [[FM radio]] is patented by inventor [[Edwin H. Armstrong]].
* '''1933:''' [[Everest and Jennings|Harry C. Jennings Sr. and Herbert Everest]], both [[mechanical engineer]]s, invented the first lightweight, steel, folding, portable [[wheelchair]] with their "X-brace" design.<ref>Everest, Herbert A., Jennings, Harry C. Sr., "Folding wheel chair", US Patent 2095411, 1937</ref><ref>{{Cite web|url=https://patents.google.com/patent/US2618319A/en|title=X-brace construction for collapsible invalids' wheel chairs}}</ref>
* '''1935:''' [[Nylon]], the first fully [[synthetic fiber]] is produced by [[Wallace Carothers]] while working at [[DuPont]].<ref name=Carothers>{{cite web|title=Wallace Hume Carothers|url=https://www.sciencehistory.org/historical-profile/wallace-hume-carothers|website=[[Science History Institute]]|date=June 2016|access-date=20 March 2018}}</ref>
* '''1938:''' [[Z1 (computer)|Z1]], built by [[Konrad Zuse]], is the first freely programmable [[computer]] in the world.
* '''1938:''' [[Nuclear fission]] discovered in experiment by chemists [[Otto Hahn]] and [[Fritz Strassmann]] and physicists [[Lise Meitner]] and [[Otto Robert Frisch]]. The [[German nuclear energy project]] was based on this research. The [[Tube Alloys]] project and, subsequently, the [[Manhattan Project]] and the [[Soviet atomic bomb project]] were influenced by this research.
* '''1939:''' G. S. Yunyev or [[Naum Gurvich]] invented the electric current [[Defibrillation#Direct current method|defibrillator]]