2N1906 semiconductor manufactured by Sylvania, listed as 2N1906 (circa 1979).

2N1905 semiconductor manufactured by Sylvania, listed as 2N1905 (circa 1979).

2N1893S semiconductor manufactured by Sylvania, listed as 2N1893S (circa 1979).

2N1893L semiconductor manufactured by Sylvania, listed as 2N1893L (circa 1979).

2N1893 semiconductor manufactured by Sylvania, listed as 2N1893 (circa 1979).

2N1892 semiconductor manufactured by Sylvania, listed as 2N1892 (circa 1979).

2N1891 semiconductor manufactured by Sylvania, listed as 2N1891 (circa 1979).

2N1890 semiconductor manufactured by Sylvania, listed as 2N1890 (circa 1979).

2N1889 semiconductor manufactured by Sylvania, listed as 2N1889 (circa 1979).

2N1868 semiconductor manufactured by Sylvania, listed as 2N1868 (circa 1979).

2N1867 semiconductor manufactured by Sylvania, listed as 2N1867 (circa 1979).

2N1866 semiconductor manufactured by Sylvania, listed as 2N1866 (circa 1979).

2N1865 semiconductor manufactured by Sylvania, listed as 2N1865 (circa 1979).

2N1864 semiconductor manufactured by Sylvania, listed as 2N1864 (circa 1979).

2N1858 semiconductor manufactured by Sylvania, listed as 2N1858 (circa 1979).

2N1854 semiconductor manufactured by Sylvania, listed as 2N1854 (circa 1979).

2N1853 semiconductor manufactured by Sylvania, listed as 2N1853 (circa 1979).

2N1850B semiconductor manufactured by Sylvania, listed as 2N1850B (circa 1979).

2N1850A semiconductor manufactured by Sylvania, listed as 2N1850A (circa 1979).

2N1850 semiconductor manufactured by Sylvania, listed as 2N1850 (circa 1979).