(1) 6141/427A Date Code 252 (produced Oct. - Dec. of 1952)
(1) F-55789 Date Code 6352 (produced Oct. - Dec. of 1952)
(1) KS-21081 Date Code 6-78 (June of 1978). This is a 7 pin solid state replacement for a 2D21 which was part of Western Elec.'s HIN system (Hybrid Integrated Network AKA Fetron).
These are being sold UNTESTED. Working condition unknown.
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