2N1478 semiconductor manufactured by Sylvania, listed as 2N1478 (circa 1979).

2N1475 semiconductor manufactured by Sylvania, listed as 2N1475 (circa 1979).

2N1474A semiconductor manufactured by Sylvania, listed as 2N1474A (circa 1979).

2N1474 semiconductor manufactured by Sylvania, listed as 2N1474 (circa 1979).

2N1473 semiconductor manufactured by Sylvania, listed as 2N1473 (circa 1979).

2N1472 semiconductor manufactured by Sylvania, listed as 2N1472 (circa 1979).

2N1471 semiconductor manufactured by Sylvania, listed as 2N1471 (circa 1979).

2N1470 semiconductor manufactured by Sylvania, listed as 2N1470 (circa 1979).

2N1469 semiconductor manufactured by Sylvania, listed as 2N1469 (circa 1979).

2N1452 semiconductor manufactured by Sylvania, listed as 2N1452 (circa 1979).

2N1451 semiconductor manufactured by Sylvania, listed as 2N1451 (circa 1979).

2N1450 semiconductor manufactured by Sylvania, listed as 2N1450 (circa 1979).

2N1449 semiconductor manufactured by Sylvania, listed as 2N1449 (circa 1979).

2N1448 semiconductor manufactured by Sylvania, listed as 2N1448 (circa 1979).

2N1447 semiconductor manufactured by Sylvania, listed as 2N1447 (circa 1979).

2N1446 semiconductor manufactured by Sylvania, listed as 2N1446 (circa 1979).

2N1443 semiconductor manufactured by Sylvania, listed as 2N1443 (circa 1979).

2N1442 semiconductor manufactured by Sylvania, listed as 2N1442 (circa 1979).

2N1441 semiconductor manufactured by Sylvania, listed as 2N1441 (circa 1979).

2N1440 semiconductor manufactured by Sylvania, listed as 2N1440 (circa 1979).