(19)

(11)

EP 0 093 169 A1

(12)

(43) Date of publication: 09.11.1983 Bulletin 1983/45 (21) Application number: 83900212.0 (22) Date of filing: 01.11.1982

(51) International Patent Classification (IPC):  G01C 19/ 08( . ) G01C 19/ 30( . ) G01C 19/ 26( . ) G01C 21/ 18( . ) (86) International application number: PCT/US1982/001547 (87) International publication number: WO 1983/001681 (11.05.1983 Gazette 1983/11)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 09.11.1981 US 19810319621 (71) Applicant: NAVIDYNE CORPORATION Newport News, VA 23606 (US)	(72) Inventors: ZAVADA, Edmund S. Achilles, VA 23001 (US) MAYER, Laurence J. Gloucester, VA 23061 (US)