(19)

(11)

EP 0 288 514 A1

(12)

(43) Date of publication: 02.11.1988 Bulletin 1988/44 (21) Application number: 87907047.0 (22) Date of filing: 23.09.1987

(51) International Patent Classification (IPC):  G01D 5/ 30( . ) G01D 5/ 34( . ) G01D 21/ 00( . ) G01F 23/ 30( . ) G01L 9/ 00( . ) G02B 6/ 36( . ) G02B 26/ 04( . ) G01D 5/ 26( . ) G01D 5/ 347( . ) G01F 1/ 06( . ) G01F 23/ 36( . ) G01L 11/ 02( . ) G02B 26/ 00( . ) (86) International application number: PCT/US1987/002404 (87) International publication number: WO 1988/002545 (07.04.1988 Gazette 1988/08)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 03.10.1986 US 19860915115 (71) Applicant: CONAX BUFFALO CORPORATION Buffalo New York 14225 (US)	(72) Inventors: POKORSKI, Joseph, D. Depew, NY 14043 (US) RHODES, Geoffrey, M. Orchard Park, NY 14127 (US) TREGAY, George, W. Amherst, NY 14226 (US) (74) Representative: Knott, Stephen Gilbert, et al  MATHISEN, MACARA & CO. The Coach House 6-8 Swakeleys Road Ickenham Uxbridge Middlesex UB10 8BZ Ickenham Uxbridge Middlesex UB10 8BZ (GB)