Antek Instruments Inc. Bester B.V. Chemplex Industries Inc. Chrompack International B.V. GAAM Gellschaft fur Analytik Messtechnik GmbH Horiba Instruments Inc. LECO Corp. Leybold Inficon Inc. Metorex Inc. Mitsubishi Kasei Corp. Electronic Materials & Instruments Div. Petrolab Corp. Philips Analytical X-Ray B.V. Rosemount Analytical Inc. SRI Instruments Strohlein GmbH & Co. Thermo Environmental Instruments Inc. Zellweger Analytics Inc. MDA Scientific