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http://www.google.com.au/patents/US2523933?utm_source=gb-gplus-share
Patent US2523933 - VENTILATING SYSTEM
VENTILATING SYSTEM
Joseph Cuthbert Akester et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2523933
Filing date
: 10 Oct 1945
Issue date
: 26 Sep 1950
Plain text
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