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http://www.google.com/patents/US472720?utm_source=gb-gplus-share
Patent US472720 - TYPE-CLEANING DEVICE FOR TYPE-WRITING MACHINES
TYPE-CLEANING DEVICE FOR TYPE-WRITING MACHINES
Overview
Abstract
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Description
Claims
Patent number
: 472720
Filing date
: Jan 2, 1892
Issue date
: Apr 12, 1892
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