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US Patent: 439,190
Coin controlled microscope
Patentees:
Alfred W. Roovers - Brooklyn, NY
Alexander H. Roovers - Brooklyn, NY

USPTO Classifications:
194/268, 359/394

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. O. Edmonds
C. R. Ferguson

Patent Dates:
Applied: Dec. 14, 1889
Granted: Oct. 28, 1890

Patent Pictures:
USPTO pdf tiff
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