1N5937B semiconductor manufactured by Sylvania, listed as 1N5937B (circa 1979).

1N5936B semiconductor manufactured by Sylvania, listed as 1N5936B (circa 1979).

1N5935B semiconductor manufactured by Sylvania, listed as 1N5935B (circa 1979).

1N5934B semiconductor manufactured by Sylvania, listed as 1N5934B (circa 1979).

1N5933B semiconductor manufactured by Sylvania, listed as 1N5933B (circa 1979).

1N5932B semiconductor manufactured by Sylvania, listed as 1N5932B (circa 1979).

1N5931B semiconductor manufactured by Sylvania, listed as 1N5931B (circa 1979).

1N5930B semiconductor manufactured by Sylvania, listed as 1N5930B (circa 1979).

1N5929B semiconductor manufactured by Sylvania, listed as 1N5929B (circa 1979).

1N5928B semiconductor manufactured by Sylvania, listed as 1N5928B (circa 1979).

1N5927B semiconductor manufactured by Sylvania, listed as 1N5927B (circa 1979).

1N5926B semiconductor manufactured by Sylvania, listed as 1N5926B (circa 1979).

1N5925B semiconductor manufactured by Sylvania, listed as 1N5925B (circa 1979).

1N5924B semiconductor manufactured by Sylvania, listed as 1N5924B (circa 1979).

1N5923B semiconductor manufactured by Sylvania, listed as 1N5923B (circa 1979).

1N5922B semiconductor manufactured by Sylvania, listed as 1N5922B (circa 1979).

1N5921B semiconductor manufactured by Sylvania, listed as 1N5921B (circa 1979).

1N5920B semiconductor manufactured by Sylvania, listed as 1N5920B (circa 1979).

1N5919B semiconductor manufactured by Sylvania, listed as 1N5919B (circa 1979).

1N5918B semiconductor manufactured by Sylvania, listed as 1N5918B (circa 1979).