| Patents for Percy G. Williams |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
 | 372,441 | Nov. 01, 1887 | W.W. Roovers, P.G. Williams | Coin operated induction coil |
 | 384,010 | Jun. 05, 1888 | W.W. Roovers, P.G. Williams | Cash drawer |
 | RE10,949 | Jul. 24, 1888 | W.W. Roovers, P.G. Williams | Coin Operated Induction Coil |
 | 403,978 | May 28, 1889 | W.W. Roovers, P.G. Williams | Coin released spirometer |
 | 447,857 | Mar. 10, 1891 | P.G. Williams | Galvanic apparatus for the human body |
 | 491,971 | Feb. 14, 1893 | W.W. Roovers, P.G. Williams | Coin controlled dice throwing machine |
 | 572,142 | Dec. 01, 1896 | P.G. Williams | Maze |
 | 590,783 | Sep. 28, 1897 | P.G. Williams | Amusement apparatus |
