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http://www.google.co.uk/patents/US1023466?utm_source=gb-gplus-share
Patent US1023466 - PTANOQRAPH CO
PTANOQRAPH CO
G. GAREIS et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 1023466
Filing date
: 23 Feb 1911
Issue date
: 16 Apr 1912
Plain text
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