Verfahren zur schliesswirksamen wechselwirkung eines schluesselartigen teils mit einem schlossartigen teil

Steven Kolber, Calculator theft prevention device ,(1976)

Norbert W. Donath, Bernhard K. Donath, Method and circuit arrangement for the electronically controlled release of door, safe and function locks using electronically coded keys ,(1978)

Perron Robert R, Fowler John T, Digital lock system having electronic key card ,(1972)

Seymour Feinland, Fredric E. Zucker, Bruce E. Hinman, Alton B. Eckert, Electronic combination lock and lock system ,(1973)

Jonathan Oseas, Walter Leonard Tuchman, Richard Edward Lennon, Stephen Michael Matyas, Paul Norman Prentice, Carl Heinz Wilhelm Meyer, A process for the verification of cryptographic operational keys used in data communication networks ,(1978)

Karl Dr Ing Goser, Juergen Dr Ing Graul, Wireless closed loop alarm system - uses digital signals with ROM-controlled code and two transceivers with logic circuitry ,(1977)

Koller Roman, Universal identity coding and material security system - has signal operated electric closing mechanism with electronically coded lock and key ,(1979)

Christian Kreppel, Fritz Mueller, Multiple lock system for coded information - uses change of master key providing new master key with altered programming ,(1980)

George Follett Abbott, Ralph Orrin Skatrud, Charles Hardin Gilley, Verfahren und vorrichtung zum betreiben einer gegen unbefugten zugang gesicherten nachrichtenuebertragungsanlage ,(1972)

Dieter Schoenfeld, Karl Fritz Reich, Key system with data carrier as key - includes data which is eased and rewritten before removal from lock ,(1979)