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US Patent: 439,189
Coin controlled microscope
Patentees: Alfred W. Roovers (exact or similar names) - Brooklyn, NY Alexander H. Roovers (exact or similar names) - Brooklyn, NY USPTO Classifications: 194/264, 359/394, 40/493 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: S. O. Edmonds C. R. Ferguson	Patent Dates: Applied: Dec. 03, 1889 Granted: Oct. 28, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen

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