TRANSISTOR MUSEUM™ Historic Transistor Photo Gallery Photo Essay – Bell Labs M1752
Photo Courtesy Bob McGarrah
Photo Essay Commentary Apparently some of the M1752 transistors were not labeled with either a color code or text, but were identified with a serial number on a paper strip attached to one of the leads. The photos above show two such units, with paper label serial numbers “DE838 and DE684”. (The top left photo provides a comparison of “DE838” with a color-coded M1752). These unmarked units appear to be physically identical to the M1752s shown earlier. The bottom photo is an extreme close-up of “DE838” and clearly illustrates the unrefined nature of the early junction transistor manufacturing processes. Go To PhotoGallery M1752 Page4
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