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Patent US220473 - IMPROVEMENT IN AEROBATS
IMPROVEMENT IN AEROBATS
JOHN J. GREENOUGH
› Overview
Abstract
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Description
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Patent number
: 220473
Filing date
: Sep 16, 1879
Issue date
: Oct 14, 1879
Inventor
:
JOHN J. GREENOUGH
Current U.S. Classification
:
244/6
;
244/35.00R
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