Inventor: Howard, Frederick H.
Inventor: Duehrsen, Carl G.
Inventor: Howard, Frederick H.
Inventor: Graham, Melville M.
Inventor: Lammerts, Walter E.
Inventor: Etter, Albert F.
Inventor: Etter, Albert F.
Inventor: Ott, William Henry
Inventor: Davis, John B., Administratix, Lida Boyer
Inventor: Briggs, Elizabeth A.
Inventor: Armacost, Walter