1N5251 semiconductor manufactured by Sylvania, listed as 1N5251 (circa 1979).

1N5177 semiconductor manufactured by Sylvania, listed as 1N5177 (circa 1979).

1N5744B semiconductor manufactured by Sylvania, listed as 1N5744B (circa 1979).

1N5577A semiconductor manufactured by Sylvania, listed as 1N5577A (circa 1979).

1N5527A semiconductor manufactured by Sylvania, listed as 1N5527A (circa 1979).

1N5377 semiconductor manufactured by Sylvania, listed as 1N5377 (circa 1979).

1N5337B semiconductor manufactured by Sylvania, listed as 1N5337B (circa 1979).

1N5250B semiconductor manufactured by Sylvania, listed as 1N5250B (circa 1979).

1N5176 semiconductor manufactured by Sylvania, listed as 1N5176 (circa 1979).

1N5744 semiconductor manufactured by Sylvania, listed as 1N5744 (circa 1979).

1N5577 semiconductor manufactured by Sylvania, listed as 1N5577 (circa 1979).

1N5527 semiconductor manufactured by Sylvania, listed as 1N5527 (circa 1979).

1N5376B semiconductor manufactured by Sylvania, listed as 1N5376B (circa 1979).

1N5337A semiconductor manufactured by Sylvania, listed as 1N5337A (circa 1979).

1N5250A semiconductor manufactured by Sylvania, listed as 1N5250A (circa 1979).

1N5743B semiconductor manufactured by Sylvania, listed as 1N5743B (circa 1979).

1N5576B semiconductor manufactured by Sylvania, listed as 1N5576B (circa 1979).

1N5526B semiconductor manufactured by Sylvania, listed as 1N5526B (circa 1979).

1N5376A semiconductor manufactured by Sylvania, listed as 1N5376A (circa 1979).

1N5337 semiconductor manufactured by Sylvania, listed as 1N5337 (circa 1979).