Teaching, or communicating with, the blind, deaf or mute

Official title: 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)

G09B21/00 (Teaching, or communicating with, the blind, deaf or mute) appears on 2,514 US grants and 2,710 published applications in this corpus.