Philco
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Philco is an American electronics manufacturer headquartered in Philadelphia. Philco was a pioneer in battery, radio, and television production. In 1961, the company was purchased by Ford and, from 1966, renamed "Philco-Ford". Ford sold the company to GTE in 1974, and it was purchased by Philips in 1981. In North America, the Philco brand is owned by Philips. In other markets, the Philco International brand is owned by Electrolux.
Philco produced Socket Power "A", "B", and "AB" Battery Eliminators, starting in August 1925. Model A-60 "A" Socket Power Battery Eliminator shown.
Philco Socket Power A & B Battery Eliminators - 1925 August brochure
Philco Model B-60 "B" Socket Power Battery Eliminator - August 1925
A Philco 90 "cathedral" style radio from 1931
Surface-barrier transistor
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The surface-barrier transistor is a type of transistor developed by Philco in 1953 as an improvement to the alloy-junction transistor and the earlier point-contact transistor. Like the modern Schottky transistor, it offered much higher speed than earlier transistors and used metal–semiconductor junctions, but unlike the schottky transistor, both junctions were metal–semiconductor junctions.
Philco's Surface-Barrier transistor shown on Motor Life (Sept 1955) magazine cover, which was also used in Chrysler's all-transistor car radio.
Sprague surface-barrier (SB100) transistor licensed by Philco Corporation
Philco SB100 surface-barrier transistor advertisement