Inventor

TRENKAMP ROBERT H

3 patents

Patents

3 patents

US4025760AMay 24, 1977

Security means for transaction terminal system

ADDRESSOGRAPH MULTIGRAPH65 citations91

US4029944AJun 14, 1977

Data transducer

ADDRESSOGRAPH MULTIGRAPH17 citations69

US4056712ANov 1, 1977

Wear compensating optical/magnetic transducer

ADDRESSOGRAPH MULTIGRAPH12 citations68