2N3576 semiconductor manufactured by Sylvania, listed as 2N3576 (circa 1979).

2N3572 semiconductor manufactured by Sylvania, listed as 2N3572 (circa 1979).

2N3571 semiconductor manufactured by Sylvania, listed as 2N3571 (circa 1979).

2N3570 semiconductor manufactured by Sylvania, listed as 2N3570 (circa 1979).

2N3569 semiconductor manufactured by Sylvania, listed as 2N3569 (circa 1979).

2N3568 semiconductor manufactured by Sylvania, listed as 2N3568 (circa 1979).

2N3567 semiconductor manufactured by Sylvania, listed as 2N3567 (circa 1979).

2N3566 semiconductor manufactured by Sylvania, listed as 2N3566 (circa 1979).

2N3565 semiconductor manufactured by Sylvania, listed as 2N3565 (circa 1979).

2N3564 semiconductor manufactured by Sylvania, listed as 2N3564 (circa 1979).

2N3563 semiconductor manufactured by Sylvania, listed as 2N3563 (circa 1979).

2N3562 semiconductor manufactured by Sylvania, listed as 2N3562 (circa 1979).

2N3550 semiconductor manufactured by Sylvania, listed as 2N3550 (circa 1979).

2N3549 semiconductor manufactured by Sylvania, listed as 2N3549 (circa 1979).

2N3548 semiconductor manufactured by Sylvania, listed as 2N3548 (circa 1979).

2N3547 semiconductor manufactured by Sylvania, listed as 2N3547 (circa 1979).

2N3545 semiconductor manufactured by Sylvania, listed as 2N3545 (circa 1979).

2N3544 semiconductor manufactured by Sylvania, listed as 2N3544 (circa 1979).

2N3527 semiconductor manufactured by Sylvania, listed as 2N3527 (circa 1979).

2N3526 semiconductor manufactured by Sylvania, listed as 2N3526 (circa 1979).