1N279 semiconductor manufactured by Allied Electronics, listed as 1N279 (circa 1964).

1N278 semiconductor manufactured by Allied Electronics, listed as 1N278 (circa 1964).

1N277 semiconductor manufactured by Allied Electronics, listed as 1N277 (circa 1964).

1N276 semiconductor manufactured by Allied Electronics, listed as 1N276 (circa 1964).

1N273 semiconductor manufactured by Allied Electronics, listed as 1N273 (circa 1964).

1N270 semiconductor manufactured by Allied Electronics, listed as 1N270 (circa 1964).

1N263 semiconductor manufactured by Allied Electronics, listed as 1N263 (circa 1964).

1N256 semiconductor manufactured by Allied Electronics, listed as 1N256 (circa 1964).

1N255R semiconductor manufactured by Allied Electronics, listed as 1N255R (circa 1964).

1N255 semiconductor manufactured by Allied Electronics, listed as 1N255 (circa 1964).

1N254R semiconductor manufactured by Allied Electronics, listed as 1N254R (circa 1964).

1N254 semiconductor manufactured by Allied Electronics, listed as 1N254 (circa 1964).

1N253R semiconductor manufactured by Allied Electronics, listed as 1N253R (circa 1964).

1N253 semiconductor manufactured by Allied Electronics, listed as 1N253 (circa 1964).

1N252 semiconductor manufactured by Allied Electronics, listed as 1N252 (circa 1964).

1N251 semiconductor manufactured by Allied Electronics, listed as 1N251 (circa 1964).

1N250C semiconductor manufactured by Allied Electronics, listed as 1N250C (circa 1964).

1N250A semiconductor manufactured by Allied Electronics, listed as 1N250A (circa 1964).

1N250 semiconductor manufactured by Allied Electronics, listed as 1N250 (circa 1964).

1N249C semiconductor manufactured by Allied Electronics, listed as 1N249C (circa 1964).