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http://www.google.co.uk/patents/US2923438?utm_source=gb-gplus-share
Patent US2923438 - E LOGAN
E LOGAN
J. E. LOGAN et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2923438
Filing date
: 9 Jun 1958
Issue date
: 2 Feb 1960
Plain text
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