MARK IV <IV> UNIT TO BEGIN CONRAC <CAX> TENDER Mark IV Industries Inc said it plans to begin a tender offer at 25 dlrs a share for all outstanding shares of Conrac Corp <CAX>, a Stamford, Conn., maker of control instruments and telecommunications products. Mark IV said it owns about 670,400 shares or about 9.9 pct of Conrac's outstanding shares. The offer, to be made through Mark IV Acquisition Corp, a wholly owned subsidiary, will not be conditioned on any minimum number of shares being tendered, the company said. The tender offer will be conditioned upon, among other things, the completion of financing arrangements. The terms and conditions of the offer will be described in documents to be filed with the Securities and Exchange Commission and mailed to Conrac shareholders as soon as possible. Bear Stearns and Co is expected to act as dealer manager for the offer, it said. A Conrac spokesman declined comment. Conrac has about 6.75 mln shares outstanding. Its shares closed off 1-3/8 at 21-1/8 as about 84,400 shares changed hands. Mark IV is a Williamsville, N.Y., maker of pastic products and industrial control equipment.