2N4867 semiconductor manufactured by Sylvania, listed as 2N4867 (circa 1979).

2N4860 semiconductor manufactured by Sylvania, listed as 2N4860 (circa 1979).

2N4859A semiconductor manufactured by Sylvania, listed as 2N4859A (circa 1979).

2N4859 semiconductor manufactured by Sylvania, listed as 2N4859 (circa 1979).

2N4857A semiconductor manufactured by Sylvania, listed as 2N4857A (circa 1979).

2N4857 semiconductor manufactured by Sylvania, listed as 2N4857 (circa 1979).

2N4856 semiconductor manufactured by Sylvania, listed as 2N4856 (circa 1979).

2N4853 semiconductor manufactured by Sylvania, listed as 2N4853 (circa 1979).

2N4852 semiconductor manufactured by Sylvania, listed as 2N4852 (circa 1979).

2N4851 semiconductor manufactured by Sylvania, listed as 2N4851 (circa 1979).

2N4453 semiconductor manufactured by Sylvania, listed as 2N4453 (circa 1979).

2N4452 semiconductor manufactured by Sylvania, listed as 2N4452 (circa 1979).

2N4451 semiconductor manufactured by Sylvania, listed as 2N4451 (circa 1979).

2N4450 semiconductor manufactured by Sylvania, listed as 2N4450 (circa 1979).

2N4449 semiconductor manufactured by Sylvania, listed as 2N4449 (circa 1979).

2N4444 semiconductor manufactured by Sylvania, listed as 2N4444 (circa 1979).

2N4443 semiconductor manufactured by Sylvania, listed as 2N4443 (circa 1979).

2N4442 semiconductor manufactured by Sylvania, listed as 2N4442 (circa 1979).

2N4441 semiconductor manufactured by Sylvania, listed as 2N4441 (circa 1979).

2N4437 semiconductor manufactured by Sylvania, listed as 2N4437 (circa 1979).