(19)

(11)

EP 0 070 893 A1

(12)

(43) Date of publication: 09.02.1983 Bulletin 1983/06 (21) Application number: 82900871.0 (22) Date of filing: 04.02.1982

(51) International Patent Classification (IPC):  G01G 9/ 00( . ) G01N 1/ 00( . ) G01N 33/ 48( . ) G01G 19/ 64( . ) G01N 1/ 38( . ) G01N 35/ 00( . ) (86) International application number: PCT/US1982/000144 (87) International publication number: WO 1982/002696 (19.08.1982 Gazette 1982/20)

(84) Designated Contracting States: FR (30) Priority: 09.02.1981 US 19810232525 09.02.1981 US 19810232531 (71) Applicant: SPIRAL SYSTEMS, INC. Cincinnati, OH 45244 (US)	(72) Inventors: CAMPBELL, Jeptha E. Cincinnati, OH 45230 (US) SCHALKOWSKY, Samuel Chevy Chase, MD 20015 (US) WHITLEY, Donald Binley West Yorkshire BD16 4HA (GB) GILCHRIST, James E. Terrace Park, OH 45174 (US) (74) Representative: Simonnot, Bernard  Cabinet Simonnot 35 rue de Clichy F-75442 Paris Cédex 09 F-75442 Paris Cédex 09 (FR)