2N4908 semiconductor manufactured by Sylvania, listed as 2N4908 (circa 1979).

2N4907 semiconductor manufactured by Sylvania, listed as 2N4907 (circa 1979).

2N4906 semiconductor manufactured by Sylvania, listed as 2N4906 (circa 1979).

2N4905 semiconductor manufactured by Sylvania, listed as 2N4905 (circa 1979).

2N4903 semiconductor manufactured by Sylvania, listed as 2N4903 (circa 1979).

2N4902 semiconductor manufactured by Sylvania, listed as 2N4902 (circa 1979).

2N4901 semiconductor manufactured by Sylvania, listed as 2N4901 (circa 1979).

2N4900 semiconductor manufactured by Sylvania, listed as 2N4900 (circa 1979).

2N4899 semiconductor manufactured by Sylvania, listed as 2N4899 (circa 1979).

2N4898 semiconductor manufactured by Sylvania, listed as 2N4898 (circa 1979).

2N4890 semiconductor manufactured by Sylvania, listed as 2N4890 (circa 1979).

2N4873 semiconductor manufactured by Sylvania, listed as 2N4873 (circa 1979).

2N4872 semiconductor manufactured by Sylvania, listed as 2N4872 (circa 1979).

2N4871 semiconductor manufactured by Sylvania, listed as 2N4871 (circa 1979).

2N4870 semiconductor manufactured by Sylvania, listed as 2N4870 (circa 1979).

2N4869A semiconductor manufactured by Sylvania, listed as 2N4869A (circa 1979).

2N4869 semiconductor manufactured by Sylvania, listed as 2N4869 (circa 1979).

2N4868A semiconductor manufactured by Sylvania, listed as 2N4868A (circa 1979).

2N4868 semiconductor manufactured by Sylvania, listed as 2N4868 (circa 1979).

2N4867A semiconductor manufactured by Sylvania, listed as 2N4867A (circa 1979).