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http://www.google.com/patents/US2231929?utm_source=gb-gplus-share
Patent US2231929 - TRIDIMENSIONAL RADIO DIRECTION
TRIDIMENSIONAL RADIO DIRECTION
Joseph Lyman et al
› Overview
Abstract
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Description
Claims
Patent number
: 2231929
Filing date
: Apr 29, 1937
Issue date
: Feb 18, 1941
Inventors
:
Joseph Lyman
,
Joseph Lyman
Current U.S. Classification
:
342/158
;
89/41.07
;
340/961
;
342/443
;
342/455
;
343/758
;
343/765
;
367/103
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Referenced by
Citing Patent
Filing date
Issue date
Original Assignee
Title
US4214241
Mar 11, 1944
Jul 22, 1980
Proximity control system
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