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http://www.google.co.uk/patents/US2693221?utm_source=gb-gplus-share
Patent US2693221 - LYIJYNEN
LYIJYNEN
Fred Lyijynen et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2693221
Filing date
: 22 Jun 1951
Issue date
: 2 Nov 1954
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