MALVERN, Pa., and TUSTIN, Calif., Dec. 23 -- Vishay Intertechnology Inc. and SI Technologies Inc. announced today they have signed a definitive merger agreement for Vishay to acquire all of the outstanding capital stock of SI Technologies in a merger transaction for $4 per share in cash for a total purchase price, including the net settlement of options and warrants, of approximately $17.65 million. Vishay will also cause the outstanding bank debt of SI, currently approximately $10.5 million, to be repaid at closing. 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