1N4425B semiconductor manufactured by Sylvania, listed as 1N4425B (circa 1979).

1N5122 semiconductor manufactured by Sylvania, listed as 1N5122 (circa 1979).

1N5022 semiconductor manufactured by Sylvania, listed as 1N5022 (circa 1979).

1N4903A semiconductor manufactured by Sylvania, listed as 1N4903A (circa 1979).

1N4829 semiconductor manufactured by Sylvania, listed as 1N4829 (circa 1979).

1N4722 semiconductor manufactured by Sylvania, listed as 1N4722 (circa 1979).

1N4554A semiconductor manufactured by Sylvania, listed as 1N4554A (circa 1979).

1N4425A semiconductor manufactured by Sylvania, listed as 1N4425A (circa 1979).

1N5121 semiconductor manufactured by Sylvania, listed as 1N5121 (circa 1979).

1N5021A semiconductor manufactured by Sylvania, listed as 1N5021A (circa 1979).

1N4903 semiconductor manufactured by Sylvania, listed as 1N4903 (circa 1979).

1N4828 semiconductor manufactured by Sylvania, listed as 1N4828 (circa 1979).

1N4721R semiconductor manufactured by Sylvania, listed as 1N4721R (circa 1979).

1N4554 semiconductor manufactured by Sylvania, listed as 1N4554 (circa 1979).

1N4425 semiconductor manufactured by Sylvania, listed as 1N4425 (circa 1979).

1N5120 semiconductor manufactured by Sylvania, listed as 1N5120 (circa 1979).

1N5021 semiconductor manufactured by Sylvania, listed as 1N5021 (circa 1979).

1N4902A semiconductor manufactured by Sylvania, listed as 1N4902A (circa 1979).

1N4827 semiconductor manufactured by Sylvania, listed as 1N4827 (circa 1979).

1N4721 semiconductor manufactured by Sylvania, listed as 1N4721 (circa 1979).