Inventor: van der Helm, Franciscus Jacobus Joseph
Inventor: van der Helm, Franciscus Jacobus Joseph
Inventor: van der Helm, Franciscus Jacobus Joseph
Inventor: van der Helm, Franciscus Jacobus Joseph
Inventor: Jessel, Jr., Walter H.
Inventor: Jessel, Jr., Walter H.
Inventor: Jessel, Jr., Walter H.
Inventor: Jessel, Jr., Walter H.
Inventor: Jessel, Jr., Walter H.
Inventor: Desclaux, Jean-Louis