2N5550 semiconductor manufactured by Sylvania, listed as 2N5550 (circa 1979).

2N5547 semiconductor manufactured by Sylvania, listed as 2N5547 (circa 1979).

2N5546 semiconductor manufactured by Sylvania, listed as 2N5546 (circa 1979).

2N5545 semiconductor manufactured by Sylvania, listed as 2N5545 (circa 1979).

2N5544 semiconductor manufactured by Sylvania, listed as 2N5544 (circa 1979).

2N5543 semiconductor manufactured by Sylvania, listed as 2N5543 (circa 1979).

2N5525 semiconductor manufactured by Sylvania, listed as 2N5525 (circa 1979).

2N5497 semiconductor manufactured by Sylvania, listed as 2N5497 (circa 1979).

2N5496 semiconductor manufactured by Sylvania, listed as 2N5496 (circa 1979).

2N5495 semiconductor manufactured by Sylvania, listed as 2N5495 (circa 1979).

2N5494 semiconductor manufactured by Sylvania, listed as 2N5494 (circa 1979).

2N5493 semiconductor manufactured by Sylvania, listed as 2N5493 (circa 1979).

2N5492 semiconductor manufactured by Sylvania, listed as 2N5492 (circa 1979).

2N5491 semiconductor manufactured by Sylvania, listed as 2N5491 (circa 1979).

2N5490 semiconductor manufactured by Sylvania, listed as 2N5490 (circa 1979).

2N5486 semiconductor manufactured by Sylvania, listed as 2N5486 (circa 1979).

2N5485 semiconductor manufactured by Sylvania, listed as 2N5485 (circa 1979).

2N5484 semiconductor manufactured by Sylvania, listed as 2N5484 (circa 1979).

2N5467 semiconductor manufactured by Sylvania, listed as 2N5467 (circa 1979).

2N5466 semiconductor manufactured by Sylvania, listed as 2N5466 (circa 1979).