(19)

(11)

EP 0 042 385 A1

(12)

(43) Date of publication: 30.12.1981 Bulletin 1981/52 (21) Application number: 80902036.0 (22) Date of filing: 15.10.1980

(51) International Patent Classification (IPC):  B24B 53/ 10( . ) (86) International application number: PCT/AU1980/000077 (87) International publication number: WO 1981/000980 (16.04.1981 Gazette 1981/09)

(84) Designated Contracting States: DE GB (30) Priority: 15.10.1979 AU 19790000926 (71) Applicant: SMITH, Robert Keith Ridleyton, S.A., 5008 (AU)	(72) Inventor: SMITH, Robert Keith Ridleyton, S.A., 5008 (AU)