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| All Patents in class 359/394 | |||||
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| Number | Date | Patentee | Title | Type | |
| 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 | ||