| Patents for Alexander H. Roovers |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
 | 287,170 | Oct. 23, 1883 | A.H. Roovers, A.W. Roovers | Electric cane |
 | 423,702 | Mar. 18, 1890 | A.H. Roovers, A.W. Roovers | Coin operated power or strength testing machine |
 | 434,608 | Aug. 19, 1890 | A.H. Roovers, A.W. Roovers | Coin controlled strength testing machine |
 | 439,189 | Oct. 28, 1890 | A.H. Roovers, A.W. Roovers | Coin controlled microscope |
 | 439,190 | Oct. 28, 1890 | A.H. Roovers, A.W. Roovers | Coin controlled microscope |
 | 553,872 | Feb. 04, 1896 | A.H. Roovers, A.W. Roovers | Vending instrument |
 | 687,167 | Nov. 19, 1901 | A.H. Roovers, A.W. Roovers | Die press |
 | 687,168 | Nov. 19, 1901 | A.H. Roovers, A.W. Roovers | Coin controlled die press |
 | 775,354 | Nov. 22, 1904 | A.H. Roovers, A.W. Roovers | Die press |
 | 781,620 | Jan. 31, 1905 | A.H. Roovers, A.W. Roovers | Die press |
