(19)

(11)

EP 0 065 962 A1

(12)

(43) Date of publication: 08.12.1982 Bulletin 1982/49 (21) Application number: 81903158.0 (22) Date of filing: 02.11.1981

(51) International Patent Classification (IPC):  E21F 1/ 06( . ) F24F 13/ 02( . ) F16L 21/ 08( . ) (86) International application number: PCT/US1981/001472 (87) International publication number: WO 1982/001926 (10.06.1982 Gazette 1982/15)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (30) Priority: 03.12.1980 US 19800212793 11.09.1981 US 19810301392 (71) Applicant: PEABODY ABC CORPORATION Warsaw, IN 46580 (US)	(72) Inventor: HOY, Robert W. Warsaw, IN 46580 (US)