Press Release: ESI : ESI Shareholders Approve Merger Agreement with MKS Instruments, Inc.

Electro Scientific Industries, Inc. (NASDAQ: ESIO), an innovator in laser-based manufacturing solutions for the micro-machining industry, announced that at a Special Meeting of Shareholders held earlier today, ESI shareholders voted to approve the previously announced definitive merger agreement with MKS Instruments, Inc. (NASDAQ: MKSI).