Inventor: Greyvenstein, Ockert F. C.
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: Stemkens, Henricus G. W.
Inventor: Unger, Christiaan
Inventor: Unger, Michael Helmet
Inventor: Rother, Reinhard W.
Inventor: Pottberg, Clifton F.
Inventor: Alan H. V. Bloom
Inventor: Sill, Benjamin W., Sill, Mrs. Paul W.