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http://www.google.ca/patents/US1678990?utm_source=gb-gplus-share
Patent US1678990 - MANSFIELD
MANSFIELD
JAMES F. MANSFIELD et al
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 1678990
Filing date
: 18 Mar 1927
Issue date
: 31 Jul 1928
Inventors
:
JAMES F. MANSFIELD
,
JAMES F. MANSFIELD
Current U.S. Classification
:
248/115
;
180/90
;
224/903
;
248/231.71
View patent at USPTO
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Drawings
Drawings