1N303A semiconductor manufactured by Allied Electronics, listed as 1N303A (circa 1964).

1N303 semiconductor manufactured by Allied Electronics, listed as 1N303 (circa 1964).

1N302A semiconductor manufactured by Allied Electronics, listed as 1N302A (circa 1964).

1N302 semiconductor manufactured by Allied Electronics, listed as 1N302 (circa 1964).

1N301A semiconductor manufactured by Allied Electronics, listed as 1N301A (circa 1964).

1N301 semiconductor manufactured by Allied Electronics, listed as 1N301 (circa 1964).

1N300A semiconductor manufactured by Allied Electronics, listed as 1N300A (circa 1964).

1N298 semiconductor manufactured by Allied Electronics, listed as 1N298 (circa 1964).

1N297A semiconductor manufactured by Allied Electronics, listed as 1N297A (circa 1964).

1N297 semiconductor manufactured by Allied Electronics, listed as 1N297 (circa 1964).

1N295 semiconductor manufactured by Allied Electronics, listed as 1N295 (circa 1964).

1N294A semiconductor manufactured by Allied Electronics, listed as 1N294A (circa 1964).

1N294 semiconductor manufactured by Allied Electronics, listed as 1N294 (circa 1964).

1N292 semiconductor manufactured by Allied Electronics, listed as 1N292 (circa 1964).

1N291 semiconductor manufactured by Allied Electronics, listed as 1N291 (circa 1964).

1N289 semiconductor manufactured by Allied Electronics, listed as 1N289 (circa 1964).

1N288 semiconductor manufactured by Allied Electronics, listed as 1N288 (circa 1964).

1N287 semiconductor manufactured by Allied Electronics, listed as 1N287 (circa 1964).

1N283 semiconductor manufactured by Allied Electronics, listed as 1N283 (circa 1964).

1N281 semiconductor manufactured by Allied Electronics, listed as 1N281 (circa 1964).