1N5028 semiconductor manufactured by Sylvania, listed as 1N5028 (circa 1979).

1N4909A semiconductor manufactured by Sylvania, listed as 1N4909A (circa 1979).

1N4834B semiconductor manufactured by Sylvania, listed as 1N4834B (circa 1979).

1N4731 semiconductor manufactured by Sylvania, listed as 1N4731 (circa 1979).

1N4617 semiconductor manufactured by Sylvania, listed as 1N4617 (circa 1979).

1N4429B semiconductor manufactured by Sylvania, listed as 1N4429B (circa 1979).

1N5134 semiconductor manufactured by Sylvania, listed as 1N5134 (circa 1979).

1N5027A semiconductor manufactured by Sylvania, listed as 1N5027A (circa 1979).

1N4909 semiconductor manufactured by Sylvania, listed as 1N4909 (circa 1979).

1N4730A semiconductor manufactured by Sylvania, listed as 1N4730A (circa 1979).

1N4609A semiconductor manufactured by Sylvania, listed as 1N4609A (circa 1979).

1N4429A semiconductor manufactured by Sylvania, listed as 1N4429A (circa 1979).

1N5133 semiconductor manufactured by Sylvania, listed as 1N5133 (circa 1979).

1N5027 semiconductor manufactured by Sylvania, listed as 1N5027 (circa 1979).

1N4908A semiconductor manufactured by Sylvania, listed as 1N4908A (circa 1979).

1N4834 semiconductor manufactured by Sylvania, listed as 1N4834 (circa 1979).

1N4730 semiconductor manufactured by Sylvania, listed as 1N4730 (circa 1979).

1N4609 semiconductor manufactured by Sylvania, listed as 1N4609 (circa 1979).

1N4429 semiconductor manufactured by Sylvania, listed as 1N4429 (circa 1979).

1N5132 semiconductor manufactured by Sylvania, listed as 1N5132 (circa 1979).