Inventor: Clark, John Reuben
Inventor: Worthington, Margaret
Inventor: Clark, John Reuben
Inventor: Clark, John Reuben, Moore, James N., Draper, Arlen
Inventor: Clark, John Reuben, Thompson, Ellen, Aguas-Alvarado, Mario
Inventor: Clark, John Reuben
Inventor: Mae B. Nettleship, Anderson Nettleship