1N445B semiconductor manufactured by Allied Electronics, listed as 1N445B (circa 1964).

1N445 semiconductor manufactured by Allied Electronics, listed as 1N445 (circa 1964).

1N444B semiconductor manufactured by Allied Electronics, listed as 1N444B (circa 1964).

1N444 semiconductor manufactured by Allied Electronics, listed as 1N444 (circa 1964).

1N443B semiconductor manufactured by Allied Electronics, listed as 1N443B (circa 1964).

1N443 semiconductor manufactured by Allied Electronics, listed as 1N443 (circa 1964).

1N442B semiconductor manufactured by Allied Electronics, listed as 1N442B (circa 1964).

1N442 semiconductor manufactured by Allied Electronics, listed as 1N442 (circa 1964).

1N441B semiconductor manufactured by Allied Electronics, listed as 1N441B (circa 1964).

1N441 semiconductor manufactured by Allied Electronics, listed as 1N441 (circa 1964).

1N440B semiconductor manufactured by Allied Electronics, listed as 1N440B (circa 1964).

1N440 semiconductor manufactured by Allied Electronics, listed as 1N440 (circa 1964).

1N434A semiconductor manufactured by Allied Electronics, listed as 1N434A (circa 1964).

1N434 semiconductor manufactured by Allied Electronics, listed as 1N434 (circa 1964).

1N433A semiconductor manufactured by Allied Electronics, listed as 1N433A (circa 1964).

1N433 semiconductor manufactured by Allied Electronics, listed as 1N433 (circa 1964).

1N432A semiconductor manufactured by Allied Electronics, listed as 1N432A (circa 1964).

1N432 semiconductor manufactured by Allied Electronics, listed as 1N432 (circa 1964).

1N430B semiconductor manufactured by Allied Electronics, listed as 1N430B (circa 1964).

1N430A semiconductor manufactured by Allied Electronics, listed as 1N430A (circa 1964).