1N5968A semiconductor manufactured by Sylvania, listed as 1N5968A (circa 1979).

1N5968 semiconductor manufactured by Sylvania, listed as 1N5968 (circa 1979).

1N5956B semiconductor manufactured by Sylvania, listed as 1N5956B (circa 1979).

1N5955B semiconductor manufactured by Sylvania, listed as 1N5955B (circa 1979).

1N5954B semiconductor manufactured by Sylvania, listed as 1N5954B (circa 1979).

1N5953B semiconductor manufactured by Sylvania, listed as 1N5953B (circa 1979).

1N5952B semiconductor manufactured by Sylvania, listed as 1N5952B (circa 1979).

1N5951B semiconductor manufactured by Sylvania, listed as 1N5951B (circa 1979).

1N5950B semiconductor manufactured by Sylvania, listed as 1N5950B (circa 1979).

1N5949B semiconductor manufactured by Sylvania, listed as 1N5949B (circa 1979).

1N5948B semiconductor manufactured by Sylvania, listed as 1N5948B (circa 1979).

1N5946B semiconductor manufactured by Sylvania, listed as 1N5946B (circa 1979).

1N5945B semiconductor manufactured by Sylvania, listed as 1N5945B (circa 1979).

1N5944B semiconductor manufactured by Sylvania, listed as 1N5944B (circa 1979).

1N5943B semiconductor manufactured by Sylvania, listed as 1N5943B (circa 1979).

1N5942B semiconductor manufactured by Sylvania, listed as 1N5942B (circa 1979).

1N5941B semiconductor manufactured by Sylvania, listed as 1N5941B (circa 1979).

1N5940B semiconductor manufactured by Sylvania, listed as 1N5940B (circa 1979).

1N5939B semiconductor manufactured by Sylvania, listed as 1N5939B (circa 1979).

1N5938B semiconductor manufactured by Sylvania, listed as 1N5938B (circa 1979).