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www.google.com.auhttp://www.google.com.au/patents/US3613146?utm_source=gb-gplus-sharePatent US3613146 - BLACKBOARD ERASER

Patent US3613146 - BLACKBOARD ERASER

BLACKBOARD ERASER

Edwin N. Oviatt et al

Abstract

Overview
Abstract
Drawings
Description
Claims

Patent number: 3613146
Filing date: 4 Feb 1969
Issue date: 19 Oct 1971

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