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http://www.google.com.au/patents/US3326042?utm_source=gb-gplus-share
Patent US3326042 - ULTRASONIC LIQUID LEVEL INDICATOR
ULTRASONIC LIQUID LEVEL INDICATOR
John D. Ross et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3326042
Filing date
: 30 Dec 1964
Issue date
: 20 Jun 1967
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