(19)

(11)

EP 0 939 940 A1

(12)

(43) Date of publication: 08.09.1999 Bulletin 1999/36 (21) Application number: 96946400.0 (22) Date of filing: 30.08.1996

(51) International Patent Classification (IPC):  G08B 21/ 24( . ) (86) International application number: PCT/US1996/014276 (87) International publication number: WO 1998/009261 (05.03.1998 Gazette 1998/09)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: Evans, Bennie R. Medicine Park, OK 73527 (US)	(72) Inventor: Ballew, Walter D. Midwest City, OK 73130 (US) (74) Representative: Gilmour, David Cedric Franklyn  POTTS, KERR & CO. 15 Hamilton Square Birkenhead Merseyside L41 6BR Birkenhead Merseyside L41 6BR (GB)