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http://www.google.co.uk/patents/US2760400?utm_source=gb-gplus-share
Patent US2760400 - BOLT HEAD WITH ATTACHED TRIANGULAR
BOLT HEAD WITH ATTACHED TRIANGULAR
Joseph A. W. Mills et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2760400
Filing date
: 14 Nov 1951
Issue date
: 1956
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