1N5221A semiconductor manufactured by Sylvania, listed as 1N5221A (circa 1979).

1N5758A semiconductor manufactured by Sylvania, listed as 1N5758A (circa 1979).

1N5587A semiconductor manufactured by Sylvania, listed as 1N5587A (circa 1979).

1N5537A semiconductor manufactured by Sylvania, listed as 1N5537A (circa 1979).

1N5387 semiconductor manufactured by Sylvania, listed as 1N5387 (circa 1979).

1N5347B semiconductor manufactured by Sylvania, listed as 1N5347B (circa 1979).

1N5260A semiconductor manufactured by Sylvania, listed as 1N5260A (circa 1979).

1N5221 semiconductor manufactured by Sylvania, listed as 1N5221 (circa 1979).

1N5758 semiconductor manufactured by Sylvania, listed as 1N5758 (circa 1979).

1N5587 semiconductor manufactured by Sylvania, listed as 1N5587 (circa 1979).

1N5537 semiconductor manufactured by Sylvania, listed as 1N5537 (circa 1979).

1N5386A semiconductor manufactured by Sylvania, listed as 1N5386A (circa 1979).

1N5347A semiconductor manufactured by Sylvania, listed as 1N5347A (circa 1979).

1N5260 semiconductor manufactured by Sylvania, listed as 1N5260 (circa 1979).

1N5220 semiconductor manufactured by Sylvania, listed as 1N5220 (circa 1979).

1N5757B semiconductor manufactured by Sylvania, listed as 1N5757B (circa 1979).

1N5586B semiconductor manufactured by Sylvania, listed as 1N5586B (circa 1979).

1N5536B semiconductor manufactured by Sylvania, listed as 1N5536B (circa 1979).

1N5386 semiconductor manufactured by Sylvania, listed as 1N5386 (circa 1979).

1N5347 semiconductor manufactured by Sylvania, listed as 1N5347 (circa 1979).