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http://www.google.com/patents/US3886311?utm_source=gb-gplus-share
Patent US3886311 - ELECTRICAL WRITING PEN AND SENSOR
ELECTRICAL WRITING PEN AND SENSOR
James L. Rodgers et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3886311
Filing date
: Apr 22, 1974
Issue date
: 1975
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