The following companies are subsidiares of MKS Instruments: Alter Power Systems, Beijing Newport Spectra-Physics Technologies Co. Ltd., Brooks Automation - Granville-Phillips, ESI China Inc., ESI Electronic Equipment (Shanghai) Co. Ltd., ESI International Corporation, ESI Japan K.K., ESI Korea Inc., ESI Vietnam Company Limited, Electro Scientific Industries, Electro Scientific Industries Europe Ltd, Electro Scientific Industries GmbH, Electro Scientific Industries Inc., Electro Scientific Industries Singapore Pte. Ltd., Eolite Systems SAS, High Q Laser GmbH, Ion Systems Inc, MKS Denmark ApS, MKS German Holding GmbH, MKS Instruments (China) Company Ltd., MKS Instruments (Hong Kong) Limited, MKS Instruments (Singapore) Pte. Ltd., MKS Instruments Deutschland GmbH, MKS Instruments ESI Switzerland GmbH, MKS Instruments Holdings Ltd, MKS Instruments Israel Ltd., MKS Instruments Italy S.r.l., MKS Instruments Mexico S. de R.L. de C.V., MKS Instruments UK Limited, MKS Japan Inc., MKS Korea Ltd., MKS Spectra Holdings Limited, MKS Taiwan Technology Limited, Micro-Controle Spectra-Physics S.A.S., Newport Corporation, Newport Instruments Canada Corporation, Newport Laser Holding GmbH, Newport Ophir Holdings Ltd., Newport Opto-Electronics Technologies (Korea) LLC, Newport Opto-Electronics Technologies (Singapore) Pte. Ltd., Newport Opto-Electronics Technologies (Wuxi) Company Limited, Newport Spectra-Physics B.V., Newport Spectra-Physics GmbH, Newport Spectra-Physics Limited, Novx Corp, Ophir Japan Ltd., Ophir Optics S.R.L., Ophir Optronics GmbH, Ophir Optronics Ltd., Ophir Optronics Solutions Ltd., Ophir Spiricon Europe GmbH, Ophir-Spiricon LLC, Plasmart, Precisive, Spectra-Physics K.K., Umetrics, V-Gen Ltd., Wenzel Instruments, and Yield Dynamics.