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http://www.google.com/patents/US419811?utm_source=gb-gplus-share
Patent US419811 - JOHN ZERR
JOHN ZERR
JOHN ZERR et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 419811
Filing date
: Apr 29, 1889
Issue date
: Jan 21, 1890
Plain text
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