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http://www.google.com.au/patents/US3671766?utm_source=gb-gplus-share
Patent US3671766 - SUBSTITUTE TOR MISSING XR
SUBSTITUTE TOR MISSING XR
Spencer D. Howe et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3671766
Filing date
: 29 Jun 1970
Issue date
: 2 Jun 1972
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