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http://www.google.co.uk/patents/US2556842?utm_source=gb-gplus-share
Patent US2556842 - INTERCHANGEABLE SHOE HEELS
INTERCHANGEABLE SHOE HEELS
Thomas Gilmour et al
Overview
Abstract
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Description
Claims
Patent number
: 2556842
Filing date
: 24 Aug 1948
Issue date
: 12 Jun 1951
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