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Spirometer

Strength Tester published 135 years ago by Blake, John F.

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Spirometer © 1889 Blake [John F. Blake].

TRIVIA

Released in February 1889.

Patented on June 18, 1889 (U.S. Patent No 405,455).

STAFF

Invented & Patented by : John Feggetter Blake

SOURCES

U.S. Patent No 405,455