note: … at the U.S. Patent Office

note: …." "Registered at the U.S. Patent Office, July 20th 1875

note: … at the U.S. Patent Office

note: … at the U.S. Patent Office

note: … at the U.S. Patent Office

note: …' registered at the U.S. Patent Office, July 20, 1875

note: …' registered at the U.S. Patent Office July 20, 1873

note: …' registered at the U.S. Patent office, July 20th, 1875