2N500 semiconductor manufactured by Sylvania, listed as 2N500 (circa 1979).

2N317A semiconductor manufactured by Sylvania, listed as 2N317A (circa 1979).

2N226 semiconductor manufactured by Sylvania, listed as 2N226 (circa 1979).

2N149 semiconductor manufactured by Sylvania, listed as 2N149 (circa 1979).

2N499A semiconductor manufactured by Sylvania, listed as 2N499A (circa 1979).

2N407 semiconductor manufactured by Sylvania, listed as 2N407 (circa 1979).

2N317 semiconductor manufactured by Sylvania, listed as 2N317 (circa 1979).

2N225 semiconductor manufactured by Sylvania, listed as 2N225 (circa 1979).

2N148C semiconductor manufactured by Sylvania, listed as 2N148C (circa 1979).

2N499 semiconductor manufactured by Sylvania, listed as 2N499 (circa 1979).

2N316A semiconductor manufactured by Sylvania, listed as 2N316A (circa 1979).

2N224 semiconductor manufactured by Sylvania, listed as 2N224 (circa 1979).

2N148B semiconductor manufactured by Sylvania, listed as 2N148B (circa 1979).

2N498 semiconductor manufactured by Sylvania, listed as 2N498 (circa 1979).

2N316 semiconductor manufactured by Sylvania, listed as 2N316 (circa 1979).

2N223 semiconductor manufactured by Sylvania, listed as 2N223 (circa 1979).

2N148A semiconductor manufactured by Sylvania, listed as 2N148A (circa 1979).

2N497A semiconductor manufactured by Sylvania, listed as 2N497A (circa 1979).

2N315B semiconductor manufactured by Sylvania, listed as 2N315B (circa 1979).

2N222A semiconductor manufactured by Sylvania, listed as 2N222A (circa 1979).