(19)

(11)

EP 0 229 062 A1

(12)

(43) Date of publication: 22.07.1987 Bulletin 1987/30 (21) Application number: 85904654.0 (22) Date of filing: 12.09.1985

(51) International Patent Classification (IPC):  G01R 19/ 165( . ) (86) International application number: PCT/GB1985/000419 (87) International publication number: WO 1986/001904 (27.03.1986 Gazette 1986/07)

(84) Designated Contracting States: BE DE FR GB IT NL SE (30) Priority: 12.09.1984 GB 19840022981 16.01.1985 GB 19850001089 30.07.1985 GB 19850019128 (71) Applicant: PROTECTOR SAFETY LIMITED Wigan Greater Manchester WN3 4DE (GB)	(72) Inventor: FEENEY, John, Robert Wigan Greater Manchester WN3 4DE (GB) (74) Representative: Atkinson, Peter Birch  Marks & Clerk Suite 301 Sunlight House Quay Street Manchester M3 3JY Manchester M3 3JY (GB)