Inventor: Madsen, Christian Hald
Inventor: Skotak, Jr., Chester
Inventor: Madsen, Christian Hald
Inventor: Vinson, Peter Edward
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: de Jongh, Johannes Adrianus Petrus
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: Madsen, Christian Hald
Inventor: van der Velden, Josephus Maria
Inventor: Bittner, Walter