2N1530 semiconductor manufactured by Sylvania, listed as 2N1530 (circa 1979).

2N1529A semiconductor manufactured by Sylvania, listed as 2N1529A (circa 1979).

2N1529 semiconductor manufactured by Sylvania, listed as 2N1529 (circa 1979).

2N1528 semiconductor manufactured by Sylvania, listed as 2N1528 (circa 1979).

2N1527 semiconductor manufactured by Sylvania, listed as 2N1527 (circa 1979).

2N1526 semiconductor manufactured by Sylvania, listed as 2N1526 (circa 1979).

2N1525 semiconductor manufactured by Sylvania, listed as 2N1525 (circa 1979).

2N1524 semiconductor manufactured by Sylvania, listed as 2N1524 (circa 1979).

2N1523 semiconductor manufactured by Sylvania, listed as 2N1523 (circa 1979).

2N1522 semiconductor manufactured by Sylvania, listed as 2N1522 (circa 1979).

2N1521 semiconductor manufactured by Sylvania, listed as 2N1521 (circa 1979).

2N1520 semiconductor manufactured by Sylvania, listed as 2N1520 (circa 1979).

2N1519 semiconductor manufactured by Sylvania, listed as 2N1519 (circa 1979).

2N1518 semiconductor manufactured by Sylvania, listed as 2N1518 (circa 1979).

2N1517A semiconductor manufactured by Sylvania, listed as 2N1517A (circa 1979).

2N1517 semiconductor manufactured by Sylvania, listed as 2N1517 (circa 1979).

2N1516 semiconductor manufactured by Sylvania, listed as 2N1516 (circa 1979).

2N1515 semiconductor manufactured by Sylvania, listed as 2N1515 (circa 1979).

2N1510 semiconductor manufactured by Sylvania, listed as 2N1510 (circa 1979).

2N1507 semiconductor manufactured by Sylvania, listed as 2N1507 (circa 1979).