2N4934 semiconductor manufactured by Sylvania, listed as 2N4934 (circa 1979).

2N4928 semiconductor manufactured by Sylvania, listed as 2N4928 (circa 1979).

2N4927 semiconductor manufactured by Sylvania, listed as 2N4927 (circa 1979).

2N4926 semiconductor manufactured by Sylvania, listed as 2N4926 (circa 1979).

2N4925 semiconductor manufactured by Sylvania, listed as 2N4925 (circa 1979).

2N4924 semiconductor manufactured by Sylvania, listed as 2N4924 (circa 1979).

2N4923 semiconductor manufactured by Sylvania, listed as 2N4923 (circa 1979).

2N4922 semiconductor manufactured by Sylvania, listed as 2N4922 (circa 1979).

2N4921 semiconductor manufactured by Sylvania, listed as 2N4921 (circa 1979).

2N4919 semiconductor manufactured by Sylvania, listed as 2N4919 (circa 1979).

2N4918 semiconductor manufactured by Sylvania, listed as 2N4918 (circa 1979).

2N4917 semiconductor manufactured by Sylvania, listed as 2N4917 (circa 1979).

2N4916 semiconductor manufactured by Sylvania, listed as 2N4916 (circa 1979).

2N4915 semiconductor manufactured by Sylvania, listed as 2N4915 (circa 1979).

2N4914 semiconductor manufactured by Sylvania, listed as 2N4914 (circa 1979).

2N4913 semiconductor manufactured by Sylvania, listed as 2N4913 (circa 1979).

2N4912 semiconductor manufactured by Sylvania, listed as 2N4912 (circa 1979).

2N4911 semiconductor manufactured by Sylvania, listed as 2N4911 (circa 1979).

2N4910 semiconductor manufactured by Sylvania, listed as 2N4910 (circa 1979).

2N4909 semiconductor manufactured by Sylvania, listed as 2N4909 (circa 1979).