2N1600 semiconductor manufactured by Sylvania, listed as 2N1600 (circa 1979).

2N1594 semiconductor manufactured by Sylvania, listed as 2N1594 (circa 1979).

2N1593 semiconductor manufactured by Sylvania, listed as 2N1593 (circa 1979).

2N1592 semiconductor manufactured by Sylvania, listed as 2N1592 (circa 1979).

2N1591 semiconductor manufactured by Sylvania, listed as 2N1591 (circa 1979).

2N1590 semiconductor manufactured by Sylvania, listed as 2N1590 (circa 1979).

2N1589 semiconductor manufactured by Sylvania, listed as 2N1589 (circa 1979).

2N1588 semiconductor manufactured by Sylvania, listed as 2N1588 (circa 1979).

2N1587 semiconductor manufactured by Sylvania, listed as 2N1587 (circa 1979).

2N1586 semiconductor manufactured by Sylvania, listed as 2N1586 (circa 1979).

2N1585 semiconductor manufactured by Sylvania, listed as 2N1585 (circa 1979).

2N1584 semiconductor manufactured by Sylvania, listed as 2N1584 (circa 1979).

2N1583 semiconductor manufactured by Sylvania, listed as 2N1583 (circa 1979).

2N1581 semiconductor manufactured by Sylvania, listed as 2N1581 (circa 1979).

2N1574 semiconductor manufactured by Sylvania, listed as 2N1574 (circa 1979).

2N1573 semiconductor manufactured by Sylvania, listed as 2N1573 (circa 1979).

2N1572 semiconductor manufactured by Sylvania, listed as 2N1572 (circa 1979).

2N1570 semiconductor manufactured by Sylvania, listed as 2N1570 (circa 1979).

2N1562 semiconductor manufactured by Sylvania, listed as 2N1562 (circa 1979).

2N1560A semiconductor manufactured by Sylvania, listed as 2N1560A (circa 1979).