2N181 semiconductor manufactured by Sylvania, listed as 2N181 (circa 1979).

2N536 semiconductor manufactured by Sylvania, listed as 2N536 (circa 1979).

2N456A semiconductor manufactured by Sylvania, listed as 2N456A (circa 1979).

2N368 semiconductor manufactured by Sylvania, listed as 2N368 (circa 1979).

2N271A semiconductor manufactured by Sylvania, listed as 2N271A (circa 1979).

2N180 semiconductor manufactured by Sylvania, listed as 2N180 (circa 1979).

2N535B semiconductor manufactured by Sylvania, listed as 2N535B (circa 1979).

2N456 semiconductor manufactured by Sylvania, listed as 2N456 (circa 1979).

2N367 semiconductor manufactured by Sylvania, listed as 2N367 (circa 1979).

2N271 semiconductor manufactured by Sylvania, listed as 2N271 (circa 1979).

2N179 semiconductor manufactured by Sylvania, listed as 2N179 (circa 1979).

2N109 semiconductor manufactured by Sylvania, listed as 2N109 (circa 1979).

2N535A semiconductor manufactured by Sylvania, listed as 2N535A (circa 1979).

2N450 semiconductor manufactured by Sylvania, listed as 2N450 (circa 1979).

2N366 semiconductor manufactured by Sylvania, listed as 2N366 (circa 1979).

2N270A semiconductor manufactured by Sylvania, listed as 2N270A (circa 1979).

2N178 semiconductor manufactured by Sylvania, listed as 2N178 (circa 1979).

2N108 semiconductor manufactured by Sylvania, listed as 2N108 (circa 1979).

2N535 semiconductor manufactured by Sylvania, listed as 2N535 (circa 1979).

2N449 semiconductor manufactured by Sylvania, listed as 2N449 (circa 1979).