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www.google.comhttp://www.google.com/patents/US3715738?utm_source=gb-gplus-sharePatent US3715738 - THRESHOLD LEVEL

Patent US3715738 - THRESHOLD LEVEL

THRESHOLD LEVEL

Kleist; Robert L. Thome et al

Abstract

Overview
Abstract
Drawings
Description
Claims

Patent number: 3715738
Filing date: Oct 19, 1970
Issue date: Feb 6, 1973

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