[Lot of] Bell Telephone Laboratories documents related to transistor fabrication [circa 1955-1956]

Descripción

This is a small lot of documents from Bell Telephone Laboratories concerning the fabrication of M-2039 Germanium Diffused-Base Transistors. Unbound; loose sheets. Consists of: 1) A 17" x 11" M-2039 Work Chart -Stage 2 Unit, showing the 31-step process of assembly from wafer fab to transistor assembly. Copy, on onion-skin paper, of a hand-written document - with a couple of inked corrections. Dated 8-15-55 ; 2) A one-page document entitled "M-2039 Germanium Diffused-Base Transistor Precautions", detailing the care to be taken during the assembly process. Dated April 26, 1956. (two copies) ; 3) Two 8" x 10" B&W images - one showing a close-up of the transistor assembly, and the other showing a work-room where individuals appear to be inspecting or hand-assembling the product. Just a bit of light bumping at the corners. Pages a bit age-toned, but clean. Pencilled number on the rear of each photo; else the photographs are clean. ; 27C. N° de ref. del artículo 62383

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