2N1742 semiconductor manufactured by Sylvania, listed as 2N1742 (circa 1979).

2N1732 semiconductor manufactured by Sylvania, listed as 2N1732 (circa 1979).

2N1731 semiconductor manufactured by Sylvania, listed as 2N1731 (circa 1979).

2N1730 semiconductor manufactured by Sylvania, listed as 2N1730 (circa 1979).

2N1729 semiconductor manufactured by Sylvania, listed as 2N1729 (circa 1979).

2N1728 semiconductor manufactured by Sylvania, listed as 2N1728 (circa 1979).

2N1727 semiconductor manufactured by Sylvania, listed as 2N1727 (circa 1979).

2N1726 semiconductor manufactured by Sylvania, listed as 2N1726 (circa 1979).

2N1713 semiconductor manufactured by Sylvania, listed as 2N1713 (circa 1979).

2N1711S semiconductor manufactured by Sylvania, listed as 2N1711S (circa 1979).

2N1711L semiconductor manufactured by Sylvania, listed as 2N1711L (circa 1979).

2N1711A semiconductor manufactured by Sylvania, listed as 2N1711A (circa 1979).

2N1711 semiconductor manufactured by Sylvania, listed as 2N1711 (circa 1979).

2N1708A semiconductor manufactured by Sylvania, listed as 2N1708A (circa 1979).

2N1708 semiconductor manufactured by Sylvania, listed as 2N1708 (circa 1979).

2N1707 semiconductor manufactured by Sylvania, listed as 2N1707 (circa 1979).

2N1706 semiconductor manufactured by Sylvania, listed as 2N1706 (circa 1979).

2N1705 semiconductor manufactured by Sylvania, listed as 2N1705 (circa 1979).

2N1704 semiconductor manufactured by Sylvania, listed as 2N1704 (circa 1979).

2N1703 semiconductor manufactured by Sylvania, listed as 2N1703 (circa 1979).