(19)

(11)

EP 0 248 834 A1

(12)

(43) Date of publication: 16.12.1987 Bulletin 1987/51 (21) Application number: 86906903.0 (22) Date of filing: 01.12.1986

(51) International Patent Classification (IPC):  H03K 5/ 003( . ) H03K 19/ 0185( . ) (86) International application number: PCT/GB1986/000730 (87) International publication number: WO 1987/003759 (18.06.1987 Gazette 1987/13)

(84) Designated Contracting States: DE FR IT NL (30) Priority: 04.12.1985 GB 19850029893 (71) Applicant: PLESSEY OVERSEAS LIMITED Ilford Essex IG1 4AQ (GB)	(72) Inventors: SAUL, Peter, Henry Towcester Northants (GB) JOY, Andrew, Keith Great Houghton North Hampton (GB) YEATES, David, Julian Abington Northants (GB) (74) Representative: Field, Howard John  THE PLESSEY COMPANY plc Intellectual Property Department Vicarage Lane Ilford Essex IG1 4AQ Ilford Essex IG1 4AQ (GB)