Patents - Notes Keywords
american 1807/02/11 -> 000000_01 - > 
american 1850/00/00 -> 000000_03 - > 
american 1871/07/11 -> 116972 - > 
american 1912/10/29 -> 1042447 - > 
american 1977/11/01 -> 4055972 - > 
american 1979/10/16 -> 4170884 - > 
6 Patents Listed