Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Shoesmith, deceased, Leonard
Inventor: Culbert, John R.
Inventor: Duffett, William E.
Inventor: Persoon, Margot J., Persoon, Johannes A.
Inventor: Duffett, William E.
Inventor: Shoesmith, Leonard H., Hesse, Peter S.
Inventor: Culbert, John R.
Inventor: Hubertus van Veen, Johannes W.
Inventor: Duffett, William E.
Inventor: Duffett, William E., Mack, Grace H.
Inventor: Duffett, William E., Mack, Grace H.
Inventor: Duffett, William E., Mack, Grace H.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.
Inventor: Duffett, William E.