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DUAL SIGNAL GUIDANCE SYSTEM FOR THE BLIND
US 3,495,213 A
Filed
: 02/14/1966
Issued
: 02/10/1970
Est. Priority Date
: 04/24/1965
Status: Expired due to Term
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Current Assignee
Selim A. Nahas
Original Assignee
Selim A. Nahas
Inventors
Nahas, Selim A.
Application Number
US04/527,184
Time in Patent Office
1,457 Days
Field of Search
US Class Current
340/944
CPC Class Codes
A61H 2003/065
in the form of braille
A61H 3/061
with electronic detecting o...
A61H 3/066
Installations on the floor,...
A61H 3/068
Sticks for blind persons
G01S 1/02
using radio waves G01S19/00...
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