2N3525 semiconductor manufactured by Sylvania, listed as 2N3525 (circa 1979).

2N3511 semiconductor manufactured by Sylvania, listed as 2N3511 (circa 1979).

2N3510 semiconductor manufactured by Sylvania, listed as 2N3510 (circa 1979).

2N3509 semiconductor manufactured by Sylvania, listed as 2N3509 (circa 1979).

2N3508 semiconductor manufactured by Sylvania, listed as 2N3508 (circa 1979).

2N3507 semiconductor manufactured by Sylvania, listed as 2N3507 (circa 1979).

2N3506 semiconductor manufactured by Sylvania, listed as 2N3506 (circa 1979).

2N3505 semiconductor manufactured by Sylvania, listed as 2N3505 (circa 1979).

2N3504 semiconductor manufactured by Sylvania, listed as 2N3504 (circa 1979).

2N3503 semiconductor manufactured by Sylvania, listed as 2N3503 (circa 1979).

2N3502 semiconductor manufactured by Sylvania, listed as 2N3502 (circa 1979).

2N3498 semiconductor manufactured by Sylvania, listed as 2N3498 (circa 1979).

2N3496 semiconductor manufactured by Sylvania, listed as 2N3496 (circa 1979).

2N3494 semiconductor manufactured by Sylvania, listed as 2N3494 (circa 1979).

2N3493 semiconductor manufactured by Sylvania, listed as 2N3493 (circa 1979).

2N3486A semiconductor manufactured by Sylvania, listed as 2N3486A (circa 1979).

2N3486 semiconductor manufactured by Sylvania, listed as 2N3486 (circa 1979).

2N3485A semiconductor manufactured by Sylvania, listed as 2N3485A (circa 1979).

2N3485 semiconductor manufactured by Sylvania, listed as 2N3485 (circa 1979).

2N3483 semiconductor manufactured by Sylvania, listed as 2N3483 (circa 1979).