2N1849B semiconductor manufactured by Sylvania, listed as 2N1849B (circa 1979).

2N1849A semiconductor manufactured by Sylvania, listed as 2N1849A (circa 1979).

2N1849 semiconductor manufactured by Sylvania, listed as 2N1849 (circa 1979).

2N1848B semiconductor manufactured by Sylvania, listed as 2N1848B (circa 1979).

2N1848A semiconductor manufactured by Sylvania, listed as 2N1848A (circa 1979).

2N1848 semiconductor manufactured by Sylvania, listed as 2N1848 (circa 1979).

2N1847B semiconductor manufactured by Sylvania, listed as 2N1847B (circa 1979).

2N1847A semiconductor manufactured by Sylvania, listed as 2N1847A (circa 1979).

2N1847 semiconductor manufactured by Sylvania, listed as 2N1847 (circa 1979).

2N1846B semiconductor manufactured by Sylvania, listed as 2N1846B (circa 1979).

2N1846A semiconductor manufactured by Sylvania, listed as 2N1846A (circa 1979).

2N1846 semiconductor manufactured by Sylvania, listed as 2N1846 (circa 1979).

2N1845B semiconductor manufactured by Sylvania, listed as 2N1845B (circa 1979).

2N1845A semiconductor manufactured by Sylvania, listed as 2N1845A (circa 1979).

2N1845 semiconductor manufactured by Sylvania, listed as 2N1845 (circa 1979).

2N1844B semiconductor manufactured by Sylvania, listed as 2N1844B (circa 1979).

2N1844A semiconductor manufactured by Sylvania, listed as 2N1844A (circa 1979).

2N1844 semiconductor manufactured by Sylvania, listed as 2N1844 (circa 1979).

2N1843B semiconductor manufactured by Sylvania, listed as 2N1843B (circa 1979).

2N1843A semiconductor manufactured by Sylvania, listed as 2N1843A (circa 1979).