2N458 semiconductor manufactured by Sylvania, listed as 2N458 (circa 1979).

2N371 semiconductor manufactured by Sylvania, listed as 2N371 (circa 1979).

2N185 semiconductor manufactured by Sylvania, listed as 2N185 (circa 1979).

2N539 semiconductor manufactured by Sylvania, listed as 2N539 (circa 1979).

2N457B semiconductor manufactured by Sylvania, listed as 2N457B (circa 1979).

2N370A semiconductor manufactured by Sylvania, listed as 2N370A (circa 1979).

2N184 semiconductor manufactured by Sylvania, listed as 2N184 (circa 1979).

2N538A semiconductor manufactured by Sylvania, listed as 2N538A (circa 1979).

2N457A semiconductor manufactured by Sylvania, listed as 2N457A (circa 1979).

2N274 semiconductor manufactured by Sylvania, listed as 2N274 (circa 1979).

2N183 semiconductor manufactured by Sylvania, listed as 2N183 (circa 1979).

2N538 semiconductor manufactured by Sylvania, listed as 2N538 (circa 1979).

2N457 semiconductor manufactured by Sylvania, listed as 2N457 (circa 1979).

2N370 semiconductor manufactured by Sylvania, listed as 2N370 (circa 1979).

2N273 semiconductor manufactured by Sylvania, listed as 2N273 (circa 1979).

2N182 semiconductor manufactured by Sylvania, listed as 2N182 (circa 1979).

2N537 semiconductor manufactured by Sylvania, listed as 2N537 (circa 1979).

2N456B semiconductor manufactured by Sylvania, listed as 2N456B (circa 1979).

2N369 semiconductor manufactured by Sylvania, listed as 2N369 (circa 1979).

2N272 semiconductor manufactured by Sylvania, listed as 2N272 (circa 1979).