In 1924 this U.S. company acquired all the Zeppelin patents
[DOC] [TLE] Rubber - Industries - Business History of Industries - Business ... [PAR] May 30, 1821 - James Boyd, of Boston, MA, received a patent for a "Fire Engine 
Hose"; fire ... air in tire; patent acquired in 1907 by British Dunlop tyre company); 
WW I .... it has purchased all patents and rights to manufacture Zeppelin dirigibles
.