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http://www.google.com.au/patents/US611662?utm_source=gb-gplus-share
Patent US611662 - AUTOMATIC ELEVATOR-GATE
AUTOMATIC ELEVATOR-GATE
ALLEN TURNER
› Overview
Abstract
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Description
Claims
Patent number
: 611662
Filing date
: 2 May 1898
Issue date
: 4 Oct 1898
Inventor
:
ALLEN TURNER
Current U.S. Classification
:
187/328
;
187/333
View patent at USPTO
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US7889240
21 Mar 2006
15 Feb 2011
Ricoh Company, Ltd.
Digital camera which detects a connection to an external device
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