2N3478 semiconductor manufactured by Sylvania, listed as 2N3478 (circa 1979).

2N3469 semiconductor manufactured by Sylvania, listed as 2N3469 (circa 1979).

2N3468 semiconductor manufactured by Sylvania, listed as 2N3468 (circa 1979).

2N3467 semiconductor manufactured by Sylvania, listed as 2N3467 (circa 1979).

2N3466 semiconductor manufactured by Sylvania, listed as 2N3466 (circa 1979).

2N3465 semiconductor manufactured by Sylvania, listed as 2N3465 (circa 1979).

2N3464 semiconductor manufactured by Sylvania, listed as 2N3464 (circa 1979).

2N3463 semiconductor manufactured by Sylvania, listed as 2N3463 (circa 1979).

2N3462 semiconductor manufactured by Sylvania, listed as 2N3462 (circa 1979).

2N3460 semiconductor manufactured by Sylvania, listed as 2N3460 (circa 1979).

2N3456 semiconductor manufactured by Sylvania, listed as 2N3456 (circa 1979).

2N3455 semiconductor manufactured by Sylvania, listed as 2N3455 (circa 1979).

2N3454 semiconductor manufactured by Sylvania, listed as 2N3454 (circa 1979).

2N3453 semiconductor manufactured by Sylvania, listed as 2N3453 (circa 1979).

2N3452 semiconductor manufactured by Sylvania, listed as 2N3452 (circa 1979).

2N3451 semiconductor manufactured by Sylvania, listed as 2N3451 (circa 1979).

2N3449 semiconductor manufactured by Sylvania, listed as 2N3449 (circa 1979).

2N3448 semiconductor manufactured by Sylvania, listed as 2N3448 (circa 1979).

2N3447 semiconductor manufactured by Sylvania, listed as 2N3447 (circa 1979).

2N3446 semiconductor manufactured by Sylvania, listed as 2N3446 (circa 1979).