Patents - Inventor Surname "Unknown"
Unknown 1867/08/07 -> 000000_04 - > 
Unknown 1887/05/10 -> 000000_07 - > 
Unknown 1887/09/27 -> 000000_08 - > 
Unknown 1891/08/04 -> 000000_09 - > 
Unknown 1892/06/14 -> 000000_10 - > 
Unknown 1897/00/00 -> 000000_11 - > 
Unknown 1908/11/06 -> 000000_12 - > 
7 Patents Listed