CPC Class Codes
A45B 3/00
Sticks combined with other ...
A61H 2003/063
with tactile perception
A61H 2201/5092
Optical sensor
A61H 3/061
with electronic detecting o...
A61H 3/068
Sticks for blind persons
G01S 17/04
Systems determining the pre...
G01S 17/48
Active triangulation system...
G01S 17/87
Combinations of systems usi...
G01S 17/88
Lidar systems specially ada...
G01S 17/931
of land vehicles
G01S 7/4813
Housing arrangements
G01S 7/4814
of transmitters alone
G01S 7/4816
of receivers alone
G09B 21/007
using both tactile and audi...
Y10S 135/911
Cane for the blind
Y10S 367/91
Portable sonar devices