U.S. Patent 0,223,898 U.S. Patent 0,223,898 US Patent 223,898: Electric lamp U.S. patent 223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 «Electric lamp US 223898 A» https://www.google.com/patents/US223898 U.S. Patent 0,223,898 publicada per Thomas Alva Edison l’any 1880 U.S. Patent 0,223,898 U.S. Patent 223,898 U.S. Patent 0,223,898 Patent number 223898 A US Patent 223898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 U.S. Patent 0,223,898 US223898 U.S. Patent 0,223,898