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http://www.google.com.au/patents/US3821523?utm_source=gb-gplus-share
Patent US3821523 - AIRCRAFT LOCATING SYSTEM USING AGILE TACAN/VORTAC/DME
AIRCRAFT LOCATING SYSTEM USING AGILE TACAN/VORTAC/DME
John P. Chisholm et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3821523
Filing date
: 7 May 1973
Issue date
: 1974
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