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http://www.google.ca/patents/US1815447?utm_source=gb-gplus-share
Patent US1815447 - ONE-SIXTH TO S
ONE-SIXTH TO S
HENRY F. RICHARDSON et al
› Overview
Abstract
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Description
Claims
Patent number
: 1815447
Filing date
: 13 Mar 1929
Issue date
: 21 Jul 1931
Inventors
:
HENRY F. RICHARDSON
,
HENRY F. RICHARDSON
Current U.S. Classification
:
52/220.1
;
174/486
View patent at USPTO
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