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http://www.google.com.au/patents/US3653595?utm_source=gb-gplus-share
Patent US3653595 - AUTOMATIC TURF WATERING SYSTEMS
AUTOMATIC TURF WATERING SYSTEMS
Julius Edward Greengard et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3653595
Filing date
: 7 Dec 1970
Issue date
: 4 Apr 1972
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