2N4412A semiconductor manufactured by Sylvania, listed as 2N4412A (circa 1979).

2N4412 semiconductor manufactured by Sylvania, listed as 2N4412 (circa 1979).

2N4411 semiconductor manufactured by Sylvania, listed as 2N4411 (circa 1979).

2N4410 semiconductor manufactured by Sylvania, listed as 2N4410 (circa 1979).

2N4409 semiconductor manufactured by Sylvania, listed as 2N4409 (circa 1979).

2N4407 semiconductor manufactured by Sylvania, listed as 2N4407 (circa 1979).

2N4406 semiconductor manufactured by Sylvania, listed as 2N4406 (circa 1979).

2N4405 semiconductor manufactured by Sylvania, listed as 2N4405 (circa 1979).

2N4404 semiconductor manufactured by Sylvania, listed as 2N4404 (circa 1979).

2N4403 semiconductor manufactured by Sylvania, listed as 2N4403 (circa 1979).

2N4402 semiconductor manufactured by Sylvania, listed as 2N4402 (circa 1979).

2N4401 semiconductor manufactured by Sylvania, listed as 2N4401 (circa 1979).

2N4400 semiconductor manufactured by Sylvania, listed as 2N4400 (circa 1979).

2N4398 semiconductor manufactured by Sylvania, listed as 2N4398 (circa 1979).

2N4396 semiconductor manufactured by Sylvania, listed as 2N4396 (circa 1979).

2N4395 semiconductor manufactured by Sylvania, listed as 2N4395 (circa 1979).

2N4392 semiconductor manufactured by Sylvania, listed as 2N4392 (circa 1979).

2N4391 semiconductor manufactured by Sylvania, listed as 2N4391 (circa 1979).

2N4389 semiconductor manufactured by Sylvania, listed as 2N4389 (circa 1979).

2N4388 semiconductor manufactured by Sylvania, listed as 2N4388 (circa 1979).