S
W1942 Herefordshire TRE Halifax crash
WArc converterA
WCK722
WCockcroft–Walton generatorB
WETA10
WFleming valveC
WInvention of radio
WInvention of the telephoneD
WLoading coil
WMagnetic-core memoryE
WPLATO (computer system)
WHistory of radarF
WAstron (wristwatch)
WSputnik 1