1N4552 semiconductor manufactured by Sylvania, listed as 1N4552 (circa 1979).

1N4423B semiconductor manufactured by Sylvania, listed as 1N4423B (circa 1979).

1N5103 semiconductor manufactured by Sylvania, listed as 1N5103 (circa 1979).

1N5018A semiconductor manufactured by Sylvania, listed as 1N5018A (circa 1979).

1N4900A semiconductor manufactured by Sylvania, listed as 1N4900A (circa 1979).

1N4820 semiconductor manufactured by Sylvania, listed as 1N4820 (circa 1979).

1N4717 semiconductor manufactured by Sylvania, listed as 1N4717 (circa 1979).

1N4551A semiconductor manufactured by Sylvania, listed as 1N4551A (circa 1979).

1N4423A semiconductor manufactured by Sylvania, listed as 1N4423A (circa 1979).

1N5102 semiconductor manufactured by Sylvania, listed as 1N5102 (circa 1979).

1N5018 semiconductor manufactured by Sylvania, listed as 1N5018 (circa 1979).

1N4900 semiconductor manufactured by Sylvania, listed as 1N4900 (circa 1979).

1N4819 semiconductor manufactured by Sylvania, listed as 1N4819 (circa 1979).

1N4716 semiconductor manufactured by Sylvania, listed as 1N4716 (circa 1979).

1N4551 semiconductor manufactured by Sylvania, listed as 1N4551 (circa 1979).

1N4423 semiconductor manufactured by Sylvania, listed as 1N4423 (circa 1979).

1N5017A semiconductor manufactured by Sylvania, listed as 1N5017A (circa 1979).

1N4899A semiconductor manufactured by Sylvania, listed as 1N4899A (circa 1979).

1N4818 semiconductor manufactured by Sylvania, listed as 1N4818 (circa 1979).

1N4715 semiconductor manufactured by Sylvania, listed as 1N4715 (circa 1979).