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Sentry Security buys in Illinois


LONG GROVE, Ill.—Chicago-based Sentry Security has purchased the assets of Mastercraft Electronics, Inc., of Deerfield, Ill., the company announced recently.

Sentry Security acquires Stand Guard Security


WHEELING, Ill.—Sentry Security, based here, has acquired Stand Guard Security, of Crystal Lake, Ill., according to the Davis Mergers and Acquisition Group, which assisted in the transaction.