Telephone-communication scheme for deaf uses existing tone-encoded telephone equipment to transmit messages. Only special equipment required is decoder at receiving telephone.
Telephone Instrument for the Deaf
NASA Tech Briefs ; 9 , 1
1985-06-01
Miscellaneous
No indication
English
AIRCRAFT, PORTABLE ELECTRONIC INSTRUMENT, SECURITY SYSTEM, AND TELEPHONE SYSTEM
European Patent Office | 2019
|TIBKAT | 1.1869,1 - 1.1869,12; mehr nicht digitalisiert
Multipurpose telephone for railroad telephone installations
Engineering Index Backfile | 1958
|Shuttle Demonstration For The Deaf
NTIS | 1994