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http://www.google.ca/patents/US3063516?utm_source=gb-gplus-share
Patent US3063516 - DUNCAN EX AL
DUNCAN EX AL
Robert B. Duncan et al
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 3063516
Filing date
: 15 Jun 1959
Issue date
: 13 Nov 1962
Inventors
:
Robert B. Duncan
,
Robert B. Duncan
Current U.S. Classification
:
187/317
View patent at USPTO
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US4452009
22 Nov 1982
5 Jun 1984
Inventio AG
Light barrier, particularly for automatically actuated lift cabin doors
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