2N1945 semiconductor manufactured by Sylvania, listed as 2N1945 (circa 1979).

2N1944 semiconductor manufactured by Sylvania, listed as 2N1944 (circa 1979).

2N1940 semiconductor manufactured by Sylvania, listed as 2N1940 (circa 1979).

2N1933 semiconductor manufactured by Sylvania, listed as 2N1933 (circa 1979).

2N1932 semiconductor manufactured by Sylvania, listed as 2N1932 (circa 1979).

2N1931 semiconductor manufactured by Sylvania, listed as 2N1931 (circa 1979).

2N1929 semiconductor manufactured by Sylvania, listed as 2N1929 (circa 1979).

2N1926 semiconductor manufactured by Sylvania, listed as 2N1926 (circa 1979).

2N1925 semiconductor manufactured by Sylvania, listed as 2N1925 (circa 1979).

2N1924 semiconductor manufactured by Sylvania, listed as 2N1924 (circa 1979).

2N1922 semiconductor manufactured by Sylvania, listed as 2N1922 (circa 1979).

2N1921 semiconductor manufactured by Sylvania, listed as 2N1921 (circa 1979).

2N1920 semiconductor manufactured by Sylvania, listed as 2N1920 (circa 1979).

2N1919 semiconductor manufactured by Sylvania, listed as 2N1919 (circa 1979).

2N1918 semiconductor manufactured by Sylvania, listed as 2N1918 (circa 1979).

2N1917 semiconductor manufactured by Sylvania, listed as 2N1917 (circa 1979).

2N1908A semiconductor manufactured by Sylvania, listed as 2N1908A (circa 1979).

2N1908 semiconductor manufactured by Sylvania, listed as 2N1908 (circa 1979).

2N1907A semiconductor manufactured by Sylvania, listed as 2N1907A (circa 1979).

2N1907 semiconductor manufactured by Sylvania, listed as 2N1907 (circa 1979).