2N657A semiconductor manufactured by Allied Electronics, listed as 2N657A (circa 1964).

2N657 semiconductor manufactured by Allied Electronics, listed as 2N657 (circa 1964).

2N656A semiconductor manufactured by Allied Electronics, listed as 2N656A (circa 1964).

2N656 semiconductor manufactured by Allied Electronics, listed as 2N656 (circa 1964).

2N498A semiconductor manufactured by Allied Electronics, listed as 2N498A (circa 1964).

2N498 semiconductor manufactured by Allied Electronics, listed as 2N498 (circa 1964).

2N497A semiconductor manufactured by Allied Electronics, listed as 2N497A (circa 1964).

2N497 semiconductor manufactured by Allied Electronics, listed as 2N497 (circa 1964).

2N424 semiconductor manufactured by Allied Electronics, listed as 2N424 (circa 1964).

2N389 semiconductor manufactured by Allied Electronics, listed as 2N389 (circa 1964).

2N398B semiconductor manufactured by Allied Electronics, listed as 2N398B (circa 1964).

2N398A semiconductor manufactured by Allied Electronics, listed as 2N398A (circa 1964).

2N398 semiconductor manufactured by Allied Electronics, listed as 2N398 (circa 1964).

2N458B semiconductor manufactured by Allied Electronics, listed as 2N458B (circa 1964).

2N458A semiconductor manufactured by Allied Electronics, listed as 2N458A (circa 1964).

2N457B semiconductor manufactured by Allied Electronics, listed as 2N457B (circa 1964).

2N457A semiconductor manufactured by Allied Electronics, listed as 2N457A (circa 1964).

2N456B semiconductor manufactured by Allied Electronics, listed as 2N456B (circa 1964).

2N456A semiconductor manufactured by Allied Electronics, listed as 2N456A (circa 1964).

2N250A semiconductor manufactured by Allied Electronics, listed as 2N250A (circa 1964).