Three 1950s Transistors
X-ray image depicting three 1950s transistors. Left to right: 1953 Bell Labs original prototype of an M1777 PNP alloy junction device—later turned into the 2N66 Western Electric's first production power transistor; a 1955 Western Electric 2N110 PNP point-contact switching transistor; and a 1958 Fairchild 2N696/697 NPN silicon device—first commercial double-diffused transistor manufactured in the Silicon Valley. Image taken with a ZEISS Xradia 620 Versa X-ray microscope.
—Herminso Villarraga-Gómez, Carl Zeiss Industrial Metrology, U.S.A.
