2N4436 semiconductor manufactured by Sylvania, listed as 2N4436 (circa 1979).

2N4435 semiconductor manufactured by Sylvania, listed as 2N4435 (circa 1979).

2N4434 semiconductor manufactured by Sylvania, listed as 2N4434 (circa 1979).

2N4433 semiconductor manufactured by Sylvania, listed as 2N4433 (circa 1979).

2N4432A semiconductor manufactured by Sylvania, listed as 2N4432A (circa 1979).

2N4432 semiconductor manufactured by Sylvania, listed as 2N4432 (circa 1979).

2N4427 semiconductor manufactured by Sylvania, listed as 2N4427 (circa 1979).

2N4425 semiconductor manufactured by Sylvania, listed as 2N4425 (circa 1979).

2N4424 semiconductor manufactured by Sylvania, listed as 2N4424 (circa 1979).

2N4419 semiconductor manufactured by Sylvania, listed as 2N4419 (circa 1979).

2N4418 semiconductor manufactured by Sylvania, listed as 2N4418 (circa 1979).

2N4417 semiconductor manufactured by Sylvania, listed as 2N4417 (circa 1979).

2N4416A semiconductor manufactured by Sylvania, listed as 2N4416A (circa 1979).

2N4416 semiconductor manufactured by Sylvania, listed as 2N4416 (circa 1979).

2N4415A semiconductor manufactured by Sylvania, listed as 2N4415A (circa 1979).

2N4415 semiconductor manufactured by Sylvania, listed as 2N4415 (circa 1979).

2N4414A semiconductor manufactured by Sylvania, listed as 2N4414A (circa 1979).

2N4414 semiconductor manufactured by Sylvania, listed as 2N4414 (circa 1979).

2N4413A semiconductor manufactured by Sylvania, listed as 2N4413A (circa 1979).

2N4413 semiconductor manufactured by Sylvania, listed as 2N4413 (circa 1979).