72452144
Mar 21, 1973
Aug 5, 1975
SIGNALING DEVICES FOR THE DEAF AND HARD OF HEARING-NAMELY, HEARING AIDS AND TRANSDUCERS FOR CONVERTING SOUNDS COMING FROM BABIES, DOOR-BELLS AND DOOR-BUZZERS, ALARM CLOCKS, AND TELEPHONES INTO LIGHT SIGNALS AND VIBRATION SIGNALS, FOR USE IN THE HOME, AUTOMOBILE, AND IN INDUSTRY
Housewares and Glass