2N431 semiconductor manufactured by Sylvania, listed as 2N431 (circa 1979).

2N343A semiconductor manufactured by Sylvania, listed as 2N343A (circa 1979).

2N251 semiconductor manufactured by Sylvania, listed as 2N251 (circa 1979).

2N176 semiconductor manufactured by Sylvania, listed as 2N176 (circa 1979).

2N519 semiconductor manufactured by Sylvania, listed as 2N519 (circa 1979).

2N428A semiconductor manufactured by Sylvania, listed as 2N428A (circa 1979).

2N338A semiconductor manufactured by Sylvania, listed as 2N338A (circa 1979).

2N250A semiconductor manufactured by Sylvania, listed as 2N250A (circa 1979).

2N175 semiconductor manufactured by Sylvania, listed as 2N175 (circa 1979).

2N518 semiconductor manufactured by Sylvania, listed as 2N518 (circa 1979).

2N428 semiconductor manufactured by Sylvania, listed as 2N428 (circa 1979).

2N337A semiconductor manufactured by Sylvania, listed as 2N337A (circa 1979).

2N250 semiconductor manufactured by Sylvania, listed as 2N250 (circa 1979).

2N517 semiconductor manufactured by Sylvania, listed as 2N517 (circa 1979).

2N427A semiconductor manufactured by Sylvania, listed as 2N427A (circa 1979).

2N337 semiconductor manufactured by Sylvania, listed as 2N337 (circa 1979).

2N249 semiconductor manufactured by Sylvania, listed as 2N249 (circa 1979).

2N174A semiconductor manufactured by Sylvania, listed as 2N174A (circa 1979).

2N516 semiconductor manufactured by Sylvania, listed as 2N516 (circa 1979).

2N427 semiconductor manufactured by Sylvania, listed as 2N427 (circa 1979).