2N1761 semiconductor manufactured by Sylvania, listed as 2N1761 (circa 1979).

2N1760 semiconductor manufactured by Sylvania, listed as 2N1760 (circa 1979).

2N1759 semiconductor manufactured by Sylvania, listed as 2N1759 (circa 1979).

2N1758 semiconductor manufactured by Sylvania, listed as 2N1758 (circa 1979).

2N1757 semiconductor manufactured by Sylvania, listed as 2N1757 (circa 1979).

2N1756 semiconductor manufactured by Sylvania, listed as 2N1756 (circa 1979).

2N1755 semiconductor manufactured by Sylvania, listed as 2N1755 (circa 1979).

2N1754 semiconductor manufactured by Sylvania, listed as 2N1754 (circa 1979).

2N1753 semiconductor manufactured by Sylvania, listed as 2N1753 (circa 1979).

2N1752 semiconductor manufactured by Sylvania, listed as 2N1752 (circa 1979).

2N1751 semiconductor manufactured by Sylvania, listed as 2N1751 (circa 1979).

2N1750 semiconductor manufactured by Sylvania, listed as 2N1750 (circa 1979).

2N1749 semiconductor manufactured by Sylvania, listed as 2N1749 (circa 1979).

2N1748A semiconductor manufactured by Sylvania, listed as 2N1748A (circa 1979).

2N1748 semiconductor manufactured by Sylvania, listed as 2N1748 (circa 1979).

2N1747 semiconductor manufactured by Sylvania, listed as 2N1747 (circa 1979).

2N1746 semiconductor manufactured by Sylvania, listed as 2N1746 (circa 1979).

2N1745 semiconductor manufactured by Sylvania, listed as 2N1745 (circa 1979).

2N1744 semiconductor manufactured by Sylvania, listed as 2N1744 (circa 1979).

2N1743 semiconductor manufactured by Sylvania, listed as 2N1743 (circa 1979).