2N5034 semiconductor manufactured by Sylvania, listed as 2N5034 (circa 1979).

2N5032 semiconductor manufactured by Sylvania, listed as 2N5032 (circa 1979).

2N5031 semiconductor manufactured by Sylvania, listed as 2N5031 (circa 1979).

2N5023 semiconductor manufactured by Sylvania, listed as 2N5023 (circa 1979).

2N5022 semiconductor manufactured by Sylvania, listed as 2N5022 (circa 1979).

2N4997 semiconductor manufactured by Sylvania, listed as 2N4997 (circa 1979).

2N4996 semiconductor manufactured by Sylvania, listed as 2N4996 (circa 1979).

2N4995 semiconductor manufactured by Sylvania, listed as 2N4995 (circa 1979).

2N4994 semiconductor manufactured by Sylvania, listed as 2N4994 (circa 1979).

2N4993 semiconductor manufactured by Sylvania, listed as 2N4993 (circa 1979).

2N4992 semiconductor manufactured by Sylvania, listed as 2N4992 (circa 1979).

2N4991 semiconductor manufactured by Sylvania, listed as 2N4991 (circa 1979).

2N4990 semiconductor manufactured by Sylvania, listed as 2N4990 (circa 1979).

2N4987 semiconductor manufactured by Sylvania, listed as 2N4987 (circa 1979).

2N4983 semiconductor manufactured by Sylvania, listed as 2N4983 (circa 1979).

2N4982 semiconductor manufactured by Sylvania, listed as 2N4982 (circa 1979).

2N4972 semiconductor manufactured by Sylvania, listed as 2N4972 (circa 1979).

2N4971 semiconductor manufactured by Sylvania, listed as 2N4971 (circa 1979).

2N4970 semiconductor manufactured by Sylvania, listed as 2N4970 (circa 1979).

2N4969 semiconductor manufactured by Sylvania, listed as 2N4969 (circa 1979).