Telephonic communications
Audio message storage, retrieval, or synthesis
Inventor
active
Telephone travel card system under the control of its customers
Telephone travel card system under the control of its customers
No associations
LandOfFree
Marvin E. Marshall does not yet have a rating. At this time, there are no reviews or comments for this inventor.
If you have personal experience with Marvin E. Marshall, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Marvin E. Marshall will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-P-1297707