| Patents for G09F 25 - Audible advertising (905) | |
|---|---|
| 02/1985 | |
| 02/19/1985 | US4500211 Audibly announcing apparatus with power saving feature |
| 09/1981 | |
| 09/22/1981 | US4291373 Navigational information announcing system for motor vehicle |
| 12/1980 | |
| 12/30/1980 | US4242731 Navigational information indicator for supplying a vehicle driver with make-turn instructions |
| 01/1978 | |
| 01/24/1978 | US4070698 Point of sale automatic announcing system with preprogrammed capacity |
| 03/1977 | |
| 03/22/1977 | US4014016 Audio indicating system |