(19)

(11)

EP 0 057 688 A1

(12)

(43) Date of publication: 18.08.1982 Bulletin 1982/33 (21) Application number: 81902167.0 (22) Date of filing: 24.07.1981

(51) International Patent Classification (IPC):  G06T 11/ 20( . ) (86) International application number: PCT/US1981/000989 (87) International publication number: WO 1982/000726 (04.03.1982 Gazette 1982/07)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 13.08.1980 US 19800178371 (71) Applicant: COMSHARE INCORPORATED Ann Arbor, MI 48106 (US)	(72) Inventors: SWONGER, Claron W. Ypsilanti, MI 48197 (US) BARKMAN, Frank John Livonia, MI 49154 (US) BROZOVICH, Linda Marie Belleville, MI 48111 (US) RILEY, Ronald John Ann Arbor, MI 48105 (US)