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http://www.google.ca/patents/US1905498?utm_source=gb-gplus-share
Patent US1905498 - VALVE SPEING
VALVE SPEING
KAEL PEEIFFEE et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 1905498
Filing date
: 19 Mar 1928
Issue date
: 25 Apr 1933
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