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http://www.google.com/patents/US471448?utm_source=gb-gplus-share
Patent US471448 - FRANK K
FRANK K
FRANK K. WARD
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 471448
Filing date
: Nov 24, 1891
Issue date
: Mar 22, 1892
Inventor
:
FRANK K. WARD
Current U.S. Classification
:
215/307
;
215/286
View patent at USPTO
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