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US Patent: 403,978
Coin released spirometer
Patentees:
Percy G. Williams (exact or similar names) - Brooklyn, NY
Wilfred W. Roovers (exact or similar names) - Brooklyn, NY

USPTO Classifications:
194/265, 194/277, 600/540

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. O. Edmonds
Fred Kemper
Patent Dates:
Applied: Dec. 24, 1888
Granted: May 28, 1889

Patent Pictures:
USPTO (New site tip)
Google Patents
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