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http://www.google.co.uk/patents/US2574090?utm_source=gb-gplus-share
Patent US2574090 - DOFSEN
DOFSEN
F. J. DOFSEN et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2574090
Filing date
: 19 Nov 1948
Issue date
: 6 Nov 1951
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