1N4553A semiconductor manufactured by Sylvania, listed as 1N4553A (circa 1979).

1N5119 semiconductor manufactured by Sylvania, listed as 1N5119 (circa 1979).

1N5020 semiconductor manufactured by Sylvania, listed as 1N5020 (circa 1979).

1N4902 semiconductor manufactured by Sylvania, listed as 1N4902 (circa 1979).

1N4826 semiconductor manufactured by Sylvania, listed as 1N4826 (circa 1979).

1N4720 semiconductor manufactured by Sylvania, listed as 1N4720 (circa 1979).

1N4553 semiconductor manufactured by Sylvania, listed as 1N4553 (circa 1979).

1N4424A semiconductor manufactured by Sylvania, listed as 1N4424A (circa 1979).

1N5118 semiconductor manufactured by Sylvania, listed as 1N5118 (circa 1979).

1N5019A semiconductor manufactured by Sylvania, listed as 1N5019A (circa 1979).

1N4901A semiconductor manufactured by Sylvania, listed as 1N4901A (circa 1979).

1N4822 semiconductor manufactured by Sylvania, listed as 1N4822 (circa 1979).

1N4719 semiconductor manufactured by Sylvania, listed as 1N4719 (circa 1979).

1N4552A semiconductor manufactured by Sylvania, listed as 1N4552A (circa 1979).

1N4424 semiconductor manufactured by Sylvania, listed as 1N4424 (circa 1979).

1N5104 semiconductor manufactured by Sylvania, listed as 1N5104 (circa 1979).

1N5019 semiconductor manufactured by Sylvania, listed as 1N5019 (circa 1979).

1N4901 semiconductor manufactured by Sylvania, listed as 1N4901 (circa 1979).

1N4821 semiconductor manufactured by Sylvania, listed as 1N4821 (circa 1979).

1N4718 semiconductor manufactured by Sylvania, listed as 1N4718 (circa 1979).