1N5224B semiconductor manufactured by Sylvania, listed as 1N5224B (circa 1979).

1N5839B semiconductor manufactured by Sylvania, listed as 1N5839B (circa 1979).

1N5590A semiconductor manufactured by Sylvania, listed as 1N5590A (circa 1979).

1N5540B semiconductor manufactured by Sylvania, listed as 1N5540B (circa 1979).

1N5394 semiconductor manufactured by Sylvania, listed as 1N5394 (circa 1979).

1N5350B semiconductor manufactured by Sylvania, listed as 1N5350B (circa 1979).

1N5263A semiconductor manufactured by Sylvania, listed as 1N5263A (circa 1979).

1N5224A semiconductor manufactured by Sylvania, listed as 1N5224A (circa 1979).

1N5838B semiconductor manufactured by Sylvania, listed as 1N5838B (circa 1979).

1N5590 semiconductor manufactured by Sylvania, listed as 1N5590 (circa 1979).

1N5540A semiconductor manufactured by Sylvania, listed as 1N5540A (circa 1979).

1N5393 semiconductor manufactured by Sylvania, listed as 1N5393 (circa 1979).

1N5350A semiconductor manufactured by Sylvania, listed as 1N5350A (circa 1979).

1N5263 semiconductor manufactured by Sylvania, listed as 1N5263 (circa 1979).

1N5224 semiconductor manufactured by Sylvania, listed as 1N5224 (circa 1979).

1N5589B semiconductor manufactured by Sylvania, listed as 1N5589B (circa 1979).

1N5540 semiconductor manufactured by Sylvania, listed as 1N5540 (circa 1979).

1N5350 semiconductor manufactured by Sylvania, listed as 1N5350 (circa 1979).

1N5262B semiconductor manufactured by Sylvania, listed as 1N5262B (circa 1979).

1N5223B semiconductor manufactured by Sylvania, listed as 1N5223B (circa 1979).