Inventor: Scheffers, Robertus
Inventor: Ranney, Thomas G.
Inventor: Scheffers, Robertus
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Bak, Elly, Steur, Nicolaas D. M.
Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: Hall, Elsie Kazerine
Inventor: Stephens, Carroll Theodore
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Koning, Lammert
Inventor: Cevasco, Jr., Robert
Inventor: Koning, Lammert