1. Stereo — 2023-09-23 15:56:38

   …ass="left" title="Blumlein Pair is still used." width="350" }} His earliest notes on the subject are dated 25 September 1931, and his patent had the title// "Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproduc…
   …ing Systems".// The application was dated 14 December 1931, and was accepted on 14 June 1933 as UK patent number 394,325. He called his technique ''Binaural Sound.'' ::c:: His c…

2. Television — 2021-11-06 16:35:18

   …', and the first television programme for the '''BBC'''. He televised the first live transmission of the Epsom Derby in 1931. {{Image url="Baird_tv.jpg" class="right" title="John Logie Baird with his television" }} == Big screen == He demons…

3. USA anthem — 2021-08-09 22:14:22

   … == It became the tune for the American patriotic song //The Star-Spangled Banner// following the War of 1812, and in **1931** was adopted as the national anthem of the United States of America. The lyrics come from "Defence of Fort M'Henry", …

4. Sinoatrial Node — 2020-08-15 18:08:00

   … :: {{Databox width="" Image="MartinFlack.jpg" title="Martin Flack" width="260" birth_date="20/3/1882" death_date="16/8/1931" }} ===Arthur Keith & Martin Flack 1907 === ~- [[Medical]]:[[1900s]] **Martin Flack**, British physiologist, discover…

5. Jet Engine — 2020-08-15 08:35:25

   …n London bought copies of my father's first turbojet patent and it was registered at the Berlin Patent Office in August 1931.' // ---- ~-// *(The German Ohain conceived of "an engine that did not require a propeller." in 1933 and patented his j…

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