1N4974 semiconductor manufactured by Sylvania, listed as 1N4974 (circa 1979).

1N4851 semiconductor manufactured by Sylvania, listed as 1N4851 (circa 1979).

1N4755 semiconductor manufactured by Sylvania, listed as 1N4755 (circa 1979).

1N4665 semiconductor manufactured by Sylvania, listed as 1N4665 (circa 1979).

1N4479 semiconductor manufactured by Sylvania, listed as 1N4479 (circa 1979).

1N4406 semiconductor manufactured by Sylvania, listed as 1N4406 (circa 1979).

1N5054 semiconductor manufactured by Sylvania, listed as 1N5054 (circa 1979).

1N4973 semiconductor manufactured by Sylvania, listed as 1N4973 (circa 1979).

1N4850B semiconductor manufactured by Sylvania, listed as 1N4850B (circa 1979).

1N4754A semiconductor manufactured by Sylvania, listed as 1N4754A (circa 1979).

1N4664 semiconductor manufactured by Sylvania, listed as 1N4664 (circa 1979).

1N4478 semiconductor manufactured by Sylvania, listed as 1N4478 (circa 1979).

1N4405B semiconductor manufactured by Sylvania, listed as 1N4405B (circa 1979).

1N5053 semiconductor manufactured by Sylvania, listed as 1N5053 (circa 1979).

1N4972 semiconductor manufactured by Sylvania, listed as 1N4972 (circa 1979).

1N4850A semiconductor manufactured by Sylvania, listed as 1N4850A (circa 1979).

1N4754 semiconductor manufactured by Sylvania, listed as 1N4754 (circa 1979).

1N4477 semiconductor manufactured by Sylvania, listed as 1N4477 (circa 1979).

1N4405A semiconductor manufactured by Sylvania, listed as 1N4405A (circa 1979).

1N5052 semiconductor manufactured by Sylvania, listed as 1N5052 (circa 1979).