Inventor

MARTENS HENRY J

4 patents

Patents

4 patents

US4221025ASep 9, 1980

Anti-theft locking device

I D ENGINEERING INC75 citations94

US3974581AAug 17, 1976

Anti-theft fastening device and tool for releasing same

I D ENGINEERING INC111 citations94

US3947930AApr 6, 1976

Anti-theft fastening device and tool for releasing same

I D ENGINEERING INC104 citations94

US4012813AMar 22, 1977

Anti-theft fastening device and tool for releasing same

I D ENGINEERING INC46 citations91