Four germanium point-contact transistors
Four germanium point-contact transistors: home made by donor (1953) (W.W. Jan/March 1954); GEC GET1 (1953); Brimar TP1 ( c.1954); other unknown
Four germanium point-contact transistors: home made by donor (1953) (W.W. Jan/March 1954); GEC GET1 (1953); Brimar TP1 ( c.1954); other unknown