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He also described several variants of the lamp, one of which uses a ruby drop in place of the carbon button. Tesla went on to develop it as a near commercial lighting product. [ 1 ] Engineer George Egely has argued that the carbon button lamp "could have been a serious competitor for the incandescent tungsten filament bulbs and the later 'neon ...
This Vought F4U Corsair with registration FAH-609 Air Force of Honduras, shot down three aircraft: a Cavalier F-51D Mustang and two Goodyear FG-1D Corsairs of the Salvadoran Air Force 17 July 1969, commanding by Captain Fernando Soto Henriquez. This was the last combat between piston engined aircraft. [citation needed]