Inventor: Yates, Frederic C.
Inventor: Yates, Frederic C.
Inventor: Koppe, Lubbertus H.
Inventor: Beekenkamp, Annie Cornelia
Inventor: Yates, Frederic C.
Inventor: Yates, Frederic C.
Inventor: Dummen, Tobias Gunter
Inventor: Ingvoldstad, Ola
Inventor: Ingvoldstad, Ola
Inventor: Ingvoldstad, Ola
Inventor: Yates, Frederic C.