2N2575 semiconductor manufactured by Allied Electronics, listed as 2N2575 (circa 1964).

2N2574 semiconductor manufactured by Allied Electronics, listed as 2N2574 (circa 1964).

2N681 semiconductor manufactured by Allied Electronics, listed as 2N681 (circa 1964).

2N2579 semiconductor manufactured by Allied Electronics, listed as 2N2579 (circa 1964).

2N2573 semiconductor manufactured by Allied Electronics, listed as 2N2573 (circa 1964).

2N2043A semiconductor manufactured by Allied Electronics, listed as 2N2043A (circa 1964).

2N2043 semiconductor manufactured by Allied Electronics, listed as 2N2043 (circa 1964).

2N2042A semiconductor manufactured by Allied Electronics, listed as 2N2042A (circa 1964).

2N2042 semiconductor manufactured by Allied Electronics, listed as 2N2042 (circa 1964).

2N655 semiconductor manufactured by Allied Electronics, listed as 2N655 (circa 1964).

2N654 semiconductor manufactured by Allied Electronics, listed as 2N654 (circa 1964).

2N653 semiconductor manufactured by Allied Electronics, listed as 2N653 (circa 1964).

2N652 semiconductor manufactured by Allied Electronics, listed as 2N652 (circa 1964).

2N650 semiconductor manufactured by Allied Electronics, listed as 2N650 (circa 1964).

2N527A semiconductor manufactured by Allied Electronics, listed as 2N527A (circa 1964).

2N526A semiconductor manufactured by Allied Electronics, listed as 2N526A (circa 1964).

2N525A semiconductor manufactured by Allied Electronics, listed as 2N525A (circa 1964).

2N524A semiconductor manufactured by Allied Electronics, listed as 2N524A (circa 1964).

2N508 semiconductor manufactured by Allied Electronics, listed as 2N508 (circa 1964).

2N467 semiconductor manufactured by Allied Electronics, listed as 2N467 (circa 1964).