2N148 semiconductor manufactured by Sylvania, listed as 2N148 (circa 1979).

2N497 semiconductor manufactured by Sylvania, listed as 2N497 (circa 1979).

2N315A semiconductor manufactured by Sylvania, listed as 2N315A (circa 1979).

2N222 semiconductor manufactured by Sylvania, listed as 2N222 (circa 1979).

2N147 semiconductor manufactured by Sylvania, listed as 2N147 (circa 1979).

2N496 semiconductor manufactured by Sylvania, listed as 2N496 (circa 1979).

2N315 semiconductor manufactured by Sylvania, listed as 2N315 (circa 1979).

2N220 semiconductor manufactured by Sylvania, listed as 2N220 (circa 1979).

2N146 semiconductor manufactured by Sylvania, listed as 2N146 (circa 1979).

2N314 semiconductor manufactured by Sylvania, listed as 2N314 (circa 1979).

2N219 semiconductor manufactured by Sylvania, listed as 2N219 (circa 1979).

2N145 semiconductor manufactured by Sylvania, listed as 2N145 (circa 1979).

2N495 semiconductor manufactured by Sylvania, listed as 2N495 (circa 1979).

2N406 semiconductor manufactured by Sylvania, listed as 2N406 (circa 1979).

2N313 semiconductor manufactured by Sylvania, listed as 2N313 (circa 1979).

2N218 semiconductor manufactured by Sylvania, listed as 2N218 (circa 1979).

2N487 semiconductor manufactured by Sylvania, listed as 2N487 (circa 1979).

2N405 semiconductor manufactured by Sylvania, listed as 2N405 (circa 1979).

2N312 semiconductor manufactured by Sylvania, listed as 2N312 (circa 1979).

2N4866 semiconductor manufactured by Sylvania, listed as 2N4866 (circa 1979).