Patents - Inventor Surname "Troast"
Troast, William F. 1888/07/24 -> 386510 - > 
Troast, William F. 1889/12/31 -> 418359 - > 
Troast, William F. 1891/12/29 -> 465897 - > 
Troast, William F. 1892/01/26 -> 467528 - > 
Troast, William F. 1892/03/08 -> 470268 - > 
Troast, William F. 1892/12/20 -> 488231 - > 
Troast, William F. 1893/05/09 -> 496921 - > 
Troast, William F. 1894/01/23 -> 513160 - > 
Troast, William F. 1895/04/02 -> 536844 - > 
Troast, William F. 1895/05/28 -> 540006 - > 
Troast, William F. 1896/12/08 -> 572586 - > 
Troast, William F. 1897/01/12 -> 574961 - > 
Troast, William F. 1897/03/16 -> 578791 - > 
Troast, William F. 1925/02/03 -> 1525340 - > 
14 Patents Listed