(19)

(11)

EP 0 025 054 A1

(12)

(43) Date of publication: 18.03.1981 Bulletin 1981/11 (21) Application number: 80900585.0 (22) Date of filing: 10.03.1980

(51) International Patent Classification (IPC):  G11C 11/ 34( . ) G11C 17/ 00( . ) G11C 14/ 00( . ) (86) International application number: PCT/US1980/000251 (87) International publication number: WO 1980/001965 (18.09.1980 Gazette 1980/21)

(84) Designated Contracting States: DE GB NL (30) Priority: 13.03.1979 US 19790020124 (71) Applicant: NCR CORPORATION Dayton, Ohio 45479 (US)	(72) Inventor: LOCKWOOD, George Corbin Dayton, OH 45429 (US) (74) Representative: Robinson, Robert George (GB)  International Patent Dept. NCR Ltd. 206 Marylebone Road GB-London NW1 6LY GB-London NW1 6LY (GB)