• Niterra Co. Ltd. (NGK Spark Plug Co. Ltd.)
• NORITAKE CO. LIMITED
• Brewer Science Inc.
• Thermco Systems Limited (Tetreon Technologies)
• SmartMembranes GmbH
• Microchemicals GmbH
• The Porous Silicon Company
• Refractron Technologies Corp.
• Siltronix Silicon Technologies
• Shanghai Famous Trade Co. Ltd.