Alois Wolfmüller and Hans Geisenhof’s patented design utilized an all metal hollow tube-frame that was revolutionary for the period.
The frame is formed of four horizontal tubes, between which the motor is mounted, and are united at their front ends with four inclined tubes connected at the top by crossbars carrying the steering head. The motor is a horizontal (parallel) two-cylinder, four-stroke, 1488cc engine that was water-cooled. The pistons move in unison, but ignition takes place in alternate cylinders on each out-stroke.
It was the first practical motorcycle to be put on the market.
The first time the word Motorrad is used is in Alois Wolfmüller and Hans Geisenhof’s patent.
Stamps of Germany (Berlin) 1983
Stamp description / Briefmarkenbeschreibung
- Ausgabepreis: 50+20 Pfennig
- First Day of Issue / Erstausgabetag: 12. April 1983
- Auflage: 2.921.000
- Entwurf: Schillinger
- Druckverfahren: Offsetdruck
Michel-Katalog-Nr: Ländercode-MiNr: 694
1896 Cover feature
- Motorcycles, sidecars and cyclecars; construction, management, repair. Pagé, Victor Wilfred (published 1914).
- German Patent and Trade Mark Office
- Deutsches Zweirad- und NSU-Museum in Neckarsulm, Germany
- Library of Congress Archive
- Canadian Intellectual Property Office
- The Digital Conservatory of Arts and Crafts
- National Conservatory of Arts and Crafts Central Library
- Center for the History of Technology and the Environment
- Center for Studies and Research in Computer Science and Communications
- National Institute of Industrial Property (France)
- European Patent Office
- The Intellectual Property Office of the United Kingdom
- Smithsonian Library