Extracts from Mingay's Electrical Weekly, 1964, 1963; Electrical and Electronic Trader, 1971; Electrical Weekly, 1959, 1958; Electronics Weekly, 1971 Unit ID: 37 Date: 1971
Extracts from "Television Digest", November 1953 - March 1954 Unit ID: 22 Date: November 1953 - March 1954