1N5188 semiconductor manufactured by Sylvania, listed as 1N5188 (circa 1979).

1N5746 semiconductor manufactured by Sylvania, listed as 1N5746 (circa 1979).

1N5578A semiconductor manufactured by Sylvania, listed as 1N5578A (circa 1979).

1N5528A semiconductor manufactured by Sylvania, listed as 1N5528A (circa 1979).

1N5378 semiconductor manufactured by Sylvania, listed as 1N5378 (circa 1979).

1N5339 semiconductor manufactured by Sylvania, listed as 1N5339 (circa 1979).

1N5251B semiconductor manufactured by Sylvania, listed as 1N5251B (circa 1979).

1N5179 semiconductor manufactured by Sylvania, listed as 1N5179 (circa 1979).

1N5745B semiconductor manufactured by Sylvania, listed as 1N5745B (circa 1979).

1N5578 semiconductor manufactured by Sylvania, listed as 1N5578 (circa 1979).

1N5528 semiconductor manufactured by Sylvania, listed as 1N5528 (circa 1979).

1N5377B semiconductor manufactured by Sylvania, listed as 1N5377B (circa 1979).

1N5338B semiconductor manufactured by Sylvania, listed as 1N5338B (circa 1979).

1N5251A semiconductor manufactured by Sylvania, listed as 1N5251A (circa 1979).

1N5178 semiconductor manufactured by Sylvania, listed as 1N5178 (circa 1979).

1N5745 semiconductor manufactured by Sylvania, listed as 1N5745 (circa 1979).

1N5577B semiconductor manufactured by Sylvania, listed as 1N5577B (circa 1979).

1N5527B semiconductor manufactured by Sylvania, listed as 1N5527B (circa 1979).

1N5377A semiconductor manufactured by Sylvania, listed as 1N5377A (circa 1979).

1N5338A semiconductor manufactured by Sylvania, listed as 1N5338A (circa 1979).