(19)

(11)

EP 0 111 477 A1

(12)

(43) Date of publication: 27.06.1984 Bulletin 1984/26 (21) Application number: 82902113.0 (22) Date of filing: 19.05.1982

(51) International Patent Classification (IPC):  E21D 9/ 10( . ) E21D 9/ 12( . ) E21D 9/ 11( . ) (86) International application number: PCT/US1982/000688 (87) International publication number: WO 1983/004068 (24.11.1983 Gazette 1983/27)

(84) Designated Contracting States: AT CH DE FR GB LI SE (71) Applicant: COSKI, William David Mercer Island, WA 98040 (US)	(72) Inventor: COSKI, William David Mercer Island, WA 98040 (US)