1N6006B semiconductor manufactured by Sylvania, listed as 1N6006B (circa 1979).

1N6005B semiconductor manufactured by Sylvania, listed as 1N6005B (circa 1979).

1N6004B semiconductor manufactured by Sylvania, listed as 1N6004B (circa 1979).

1N6003B semiconductor manufactured by Sylvania, listed as 1N6003B (circa 1979).

1N6002B semiconductor manufactured by Sylvania, listed as 1N6002B (circa 1979).

1N6001B semiconductor manufactured by Sylvania, listed as 1N6001B (circa 1979).

1N5999B semiconductor manufactured by Sylvania, listed as 1N5999B (circa 1979).

1N5998B semiconductor manufactured by Sylvania, listed as 1N5998B (circa 1979).

1N5997B semiconductor manufactured by Sylvania, listed as 1N5997B (circa 1979).

1N5996B semiconductor manufactured by Sylvania, listed as 1N5996B (circa 1979).

1N5995B semiconductor manufactured by Sylvania, listed as 1N5995B (circa 1979).

1N5994B semiconductor manufactured by Sylvania, listed as 1N5994B (circa 1979).

1N5992B semiconductor manufactured by Sylvania, listed as 1N5992B (circa 1979).

1N5991B semiconductor manufactured by Sylvania, listed as 1N5991B (circa 1979).

1N5990B semiconductor manufactured by Sylvania, listed as 1N5990B (circa 1979).

1N5989B semiconductor manufactured by Sylvania, listed as 1N5989B (circa 1979).

1N5988B semiconductor manufactured by Sylvania, listed as 1N5988B (circa 1979).

1N5987B semiconductor manufactured by Sylvania, listed as 1N5987B (circa 1979).

1N5986B semiconductor manufactured by Sylvania, listed as 1N5986B (circa 1979).

1N5985B semiconductor manufactured by Sylvania, listed as 1N5985B (circa 1979).