(19)

(11)

EP 0 655 980 A1

(12)

(43) Date of publication: 07.06.1995 Bulletin 1995/23 (21) Application number: 93916647.0 (22) Date of filing: 21.06.1993

(51) International Patent Classification (IPC):  B06B 1/ 02( . ) B60Q 5/ 00( . ) B60Q 1/ 54( . ) (86) International application number: PCT/US1993/005911 (87) International publication number: WO 1994/026555 (24.11.1994 Gazette 1994/26)

(84) Designated Contracting States: DE ES FR GB IT SE (30) Priority: 18.05.1993 US 19930063432 (71) Applicant: SPARTON CORPORATION Jackson, MI 49202 (US)	(72) Inventors: TURLAIS, Juris Flora, IL 62839 (US) DAVIS, Stuart, D. Imlay City, MI 48444 (US) FARIS, Edward, G. Jackson, MI 49203 (US) DIETRICH, Steven, L. Jackson, MI 49201 (US) HERTENSTEIN, Jeffrey G. Flora, IL 62823 (US) (74) Representative: Ben-Nathan, Laurence Albert, et al  Urquhart-Dykes & Lord 91 Wimpole Street London W1M 8AH London W1M 8AH (GB)