Telephonic communications
Call or terminal access alarm or control
At substation
Inventor
active
Crack monitoring apparatus
Crack monitoring apparatus
Telephone call screening circuit
No associations
LandOfFree
David M. Sanford does not yet have a rating. At this time, there are no reviews or comments for this inventor.
If you have personal experience with David M. Sanford, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and David M. Sanford will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-P-851716