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http://www.google.co.uk/patents/US1867809?utm_source=gb-gplus-share
Patent US1867809 - PROPELLER ASSEMBLY FOR AIRSHIPS
PROPELLER ASSEMBLY FOR AIRSHIPS
HERBERT L. CHASE et al
Overview
Abstract
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Description
Claims
Patent number
: 1867809
Filing date
: 9 Sep 1930
Issue date
: 19 Jul 1932
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