Inventor: van Langen, Gerard
Inventor: van Langen, Gerard
Inventor: van Langen, Gerard
Inventor: Smit, Obed Jacob
Inventor: Smit, Obed Jacob
Inventor: Koning, Lammert
Inventor: Stroet, Theodorus B. J.
Inventor: Stroet, Theodorus B. J.
Inventor: Stroet, Theodorus B. J.
Inventor: Stroet, Theodorus B. J.