2N4968 semiconductor manufactured by Sylvania, listed as 2N4968 (circa 1979).

2N4967 semiconductor manufactured by Sylvania, listed as 2N4967 (circa 1979).

2N4966 semiconductor manufactured by Sylvania, listed as 2N4966 (circa 1979).

2N4965 semiconductor manufactured by Sylvania, listed as 2N4965 (circa 1979).

2N4964 semiconductor manufactured by Sylvania, listed as 2N4964 (circa 1979).

2N4963 semiconductor manufactured by Sylvania, listed as 2N4963 (circa 1979).

2N4962 semiconductor manufactured by Sylvania, listed as 2N4962 (circa 1979).

2N4961 semiconductor manufactured by Sylvania, listed as 2N4961 (circa 1979).

2N4960 semiconductor manufactured by Sylvania, listed as 2N4960 (circa 1979).

2N4954 semiconductor manufactured by Sylvania, listed as 2N4954 (circa 1979).

2N4953 semiconductor manufactured by Sylvania, listed as 2N4953 (circa 1979).

2N4952 semiconductor manufactured by Sylvania, listed as 2N4952 (circa 1979).

2N4951 semiconductor manufactured by Sylvania, listed as 2N4951 (circa 1979).

2N4948 semiconductor manufactured by Sylvania, listed as 2N4948 (circa 1979).

2N4946 semiconductor manufactured by Sylvania, listed as 2N4946 (circa 1979).

2N4945 semiconductor manufactured by Sylvania, listed as 2N4945 (circa 1979).

2N4944 semiconductor manufactured by Sylvania, listed as 2N4944 (circa 1979).

2N4943 semiconductor manufactured by Sylvania, listed as 2N4943 (circa 1979).

2N4936 semiconductor manufactured by Sylvania, listed as 2N4936 (circa 1979).

2N4935 semiconductor manufactured by Sylvania, listed as 2N4935 (circa 1979).