2N1439 semiconductor manufactured by Sylvania, listed as 2N1439 (circa 1979).

2N1436 semiconductor manufactured by Sylvania, listed as 2N1436 (circa 1979).

2N1435 semiconductor manufactured by Sylvania, listed as 2N1435 (circa 1979).

2N1434 semiconductor manufactured by Sylvania, listed as 2N1434 (circa 1979).

2N1433 semiconductor manufactured by Sylvania, listed as 2N1433 (circa 1979).

2N1432 semiconductor manufactured by Sylvania, listed as 2N1432 (circa 1979).

2N1431 semiconductor manufactured by Sylvania, listed as 2N1431 (circa 1979).

2N1430 semiconductor manufactured by Sylvania, listed as 2N1430 (circa 1979).

2N1429 semiconductor manufactured by Sylvania, listed as 2N1429 (circa 1979).

2N1428 semiconductor manufactured by Sylvania, listed as 2N1428 (circa 1979).

2N1427 semiconductor manufactured by Sylvania, listed as 2N1427 (circa 1979).

2N1426 semiconductor manufactured by Sylvania, listed as 2N1426 (circa 1979).

2N1425 semiconductor manufactured by Sylvania, listed as 2N1425 (circa 1979).

2N1423 semiconductor manufactured by Sylvania, listed as 2N1423 (circa 1979).

2N1422 semiconductor manufactured by Sylvania, listed as 2N1422 (circa 1979).

2N1420A semiconductor manufactured by Sylvania, listed as 2N1420A (circa 1979).

2N1420 semiconductor manufactured by Sylvania, listed as 2N1420 (circa 1979).

2N1419 semiconductor manufactured by Sylvania, listed as 2N1419 (circa 1979).

2N1418 semiconductor manufactured by Sylvania, listed as 2N1418 (circa 1979).

2N1417 semiconductor manufactured by Sylvania, listed as 2N1417 (circa 1979).