2N356 semiconductor manufactured by Sylvania, listed as 2N356 (circa 1979).

2N257A semiconductor manufactured by Sylvania, listed as 2N257A (circa 1979).

2N524 semiconductor manufactured by Sylvania, listed as 2N524 (circa 1979).

2N441 semiconductor manufactured by Sylvania, listed as 2N441 (circa 1979).

2N353 semiconductor manufactured by Sylvania, listed as 2N353 (circa 1979).

2N257 semiconductor manufactured by Sylvania, listed as 2N257 (circa 1979).

2N176A semiconductor manufactured by Sylvania, listed as 2N176A (circa 1979).

2N523A semiconductor manufactured by Sylvania, listed as 2N523A (circa 1979).

2N440A semiconductor manufactured by Sylvania, listed as 2N440A (circa 1979).

2N352 semiconductor manufactured by Sylvania, listed as 2N352 (circa 1979).

2N256A semiconductor manufactured by Sylvania, listed as 2N256A (circa 1979).

2N523 semiconductor manufactured by Sylvania, listed as 2N523 (circa 1979).

2N440 semiconductor manufactured by Sylvania, listed as 2N440 (circa 1979).

2N351A semiconductor manufactured by Sylvania, listed as 2N351A (circa 1979).

2N256 semiconductor manufactured by Sylvania, listed as 2N256 (circa 1979).

2N522A semiconductor manufactured by Sylvania, listed as 2N522A (circa 1979).

2N439A semiconductor manufactured by Sylvania, listed as 2N439A (circa 1979).

2N351 semiconductor manufactured by Sylvania, listed as 2N351 (circa 1979).

2N255A semiconductor manufactured by Sylvania, listed as 2N255A (circa 1979).

2N522 semiconductor manufactured by Sylvania, listed as 2N522 (circa 1979).