(19)

(11)

EP 0 076 253 A1

(12)

(43) Date of publication: 13.04.1983 Bulletin 1983/15 (21) Application number: 81901756.0 (22) Date of filing: 06.04.1981

(51) International Patent Classification (IPC):  H03H 9/ 02( . ) (86) International application number: PCT/US1981/000452 (87) International publication number: WO 1982/003511 (14.10.1982 Gazette 1982/25)

(84) Designated Contracting States: AT CH DE FR GB LI LU NL SE (71) Applicant: GTE PRODUCTS CORPORATION Stamford, CT 06904 (US)