TRANSISTOR
MUSEUM™ Historic Transistor Photo
Gallery |
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HISTORIC
NOTES William
Shockley filed the original patent for the junction transistor on June 26,
1948, and it was issued, in part, as patent 2,569,347 on Sept 25, 1951. (See Proceedings of the IEEE, January
1996, p191-217). Work was done during
this timeframe at Bell Labs to develop and refine junction transistor
technology, with the result that a limited number of developmental junction
units were produced. The initial
model number for the developmental version of this transistor was M1752 –
actual units were labeled with the handwritten text “M1752” or with the
color-coded equivalent (violet, green, red).
Units were also identified with a handwritten serial number. The two units shown in the photo above
illustrate both identification techniques, with the serial number “DN335”
shown on the reverse side of the unit marked “M1752”, and the serial number
“EA926” on the reverse side of the color-coded unit. These units are very rare and represent
the earliest efforts to manufacture functional germanium junction
transistors. (The book, “Crystal
Fire” by Riordan and Hoddeson, provides excellent coverage of this historic
work at Bell Labs). |
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