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http://www.google.co.uk/patents/US3820661?utm_source=gb-gplus-share
Patent US3820661 - MICHEL PAGES
MICHEL PAGES
Michel Pages et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3820661
Filing date
: 23 Apr 1971
Issue date
: 28 Jun 1974
Plain text
PDF
