2N501A semiconductor manufactured by Sylvania, listed as 2N501A (circa 1979).

2N408 semiconductor manufactured by Sylvania, listed as 2N408 (circa 1979).

2N323 semiconductor manufactured by Sylvania, listed as 2N323 (circa 1979).

2N155 semiconductor manufactured by Sylvania, listed as 2N155 (circa 1979).

2N322 semiconductor manufactured by Sylvania, listed as 2N322 (circa 1979).

2N151 semiconductor manufactured by Sylvania, listed as 2N151 (circa 1979).

2N501 semiconductor manufactured by Sylvania, listed as 2N501 (circa 1979).

2N321 semiconductor manufactured by Sylvania, listed as 2N321 (circa 1979).

2N230 semiconductor manufactured by Sylvania, listed as 2N230 (circa 1979).

2N150A semiconductor manufactured by Sylvania, listed as 2N150A (circa 1979).

2N320 semiconductor manufactured by Sylvania, listed as 2N320 (circa 1979).

2N229 semiconductor manufactured by Sylvania, listed as 2N229 (circa 1979).

2N150 semiconductor manufactured by Sylvania, listed as 2N150 (circa 1979).

2N407J semiconductor manufactured by Sylvania, listed as 2N407J (circa 1979).

2N319 semiconductor manufactured by Sylvania, listed as 2N319 (circa 1979).

2N228 semiconductor manufactured by Sylvania, listed as 2N228 (circa 1979).

2N149B semiconductor manufactured by Sylvania, listed as 2N149B (circa 1979).

2N318 semiconductor manufactured by Sylvania, listed as 2N318 (circa 1979).

2N227 semiconductor manufactured by Sylvania, listed as 2N227 (circa 1979).

2N149A semiconductor manufactured by Sylvania, listed as 2N149A (circa 1979).