DIFF Subgroup
G09B 21/04 Devices for conversing with the deaf-blind
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Teaching, or communicating with, the blind, deaf or mute > Devices for conversing with the deaf-blind
CPC:
Teaching, or communicating with, the blind, deaf or mute (audible presentation of material to be studied G09B5/04; devices or methods for replacing direct visual or auditory perception by another kind of perception A61F9/08, A61F11/04; audible indication of meter readings or of colour G01D7/12; watches for blind persons G04B25/02; speech analysis, speech recognition G10L; sound-recording or reproducing, per se G11B) > Devices for conversing with the deaf-blind
No child classifications to compare. This is a leaf node in both IPC and CPC.