2N4014 semiconductor manufactured by Sylvania, listed as 2N4014 (circa 1979).

2N4013 semiconductor manufactured by Sylvania, listed as 2N4013 (circa 1979).

2N3995 semiconductor manufactured by Sylvania, listed as 2N3995 (circa 1979).

2N3985 semiconductor manufactured by Sylvania, listed as 2N3985 (circa 1979).

2N3984 semiconductor manufactured by Sylvania, listed as 2N3984 (circa 1979).

2N3983 semiconductor manufactured by Sylvania, listed as 2N3983 (circa 1979).

2N3979 semiconductor manufactured by Sylvania, listed as 2N3979 (circa 1979).

2N3978 semiconductor manufactured by Sylvania, listed as 2N3978 (circa 1979).

2N3977 semiconductor manufactured by Sylvania, listed as 2N3977 (circa 1979).

2N3976 semiconductor manufactured by Sylvania, listed as 2N3976 (circa 1979).

2N3975 semiconductor manufactured by Sylvania, listed as 2N3975 (circa 1979).

2N3971 semiconductor manufactured by Sylvania, listed as 2N3971 (circa 1979).

2N3970 semiconductor manufactured by Sylvania, listed as 2N3970 (circa 1979).

2N3969A semiconductor manufactured by Sylvania, listed as 2N3969A (circa 1979).

2N3969 semiconductor manufactured by Sylvania, listed as 2N3969 (circa 1979).

2N3968A semiconductor manufactured by Sylvania, listed as 2N3968A (circa 1979).

2N3968 semiconductor manufactured by Sylvania, listed as 2N3968 (circa 1979).

2N3967A semiconductor manufactured by Sylvania, listed as 2N3967A (circa 1979).

2N3967 semiconductor manufactured by Sylvania, listed as 2N3967 (circa 1979).

2N3965 semiconductor manufactured by Sylvania, listed as 2N3965 (circa 1979).