Inventor: van Andel, Jacob
Inventor: van Andel, Jacob
Inventor: van Andel, Jacob
Inventor: Bak, Gerardus J., Steur, Nicolaas D.
Inventor: Bak, Gerardus J.
Inventor: Kuipers, Nico J.
Inventor: Kuipers, Nico J.
Inventor: Kuipers, Nico J.
Inventor: van Andel, Jacob
Inventor: van Andel, Jacob
Inventor: deRuiter, Gijsbert
Inventor: Hilverda, Jan J.
Inventor: van der Meys, J. H.
Inventor: Bak, Gerardus J., Steur, Nicolaas D.
Inventor: Hilverda, Jan J.
Inventor: Schenk, Pieter C.
Inventor: de Ruiter, Gijsbert
Inventor: Hilverda, Jan J.
Inventor: Hilverda, Jan J.