Alcatel

Anritsu

AVO Ltd.

Ballantine

BK Precision

Boonton

Data I/O

Datentechnik

Datron Instruments

Datron

Dranetz

Symmetricom (Efratom)

Frequency Electronics Inc.

Fluke

GE Druck

GE Druck Ltd

GN Nettest

ABB Metrawatt Goerz

Gould

General Radio Corp.

HAMEG

Agilent (HP)

Keithley

Krohn-Hite

Le Croy

Liedler

Lucent Technologies

Marconi

National Instruments

Norma LEM

OLTRONIX

Oscilloquartz SA.

Philips

Plisch

PTS

Rohde & Schwarz

Racal Dana

Radio Corp. of America

Reinhardt

Rigol

Siemens

Schlumberger Solartron

Sorensen

Spirent (TAS)

Stanford Research Systems

STR (Alcatel)

Schmid Fernmeldetechnik

Tektronix

TES