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http://www.google.ca/patents/US3845372?utm_source=gb-gplus-share
Patent US3845372 - WTTX AT/AG
WTTX AT/AG
William L. Ringland et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3845372
Filing date
: 26 Jan 1973
Issue date
: 1974
Plain text
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