SEAL <SINC> ACQUIRES ADEMCO LTD Seal Inc said it acquired Ademco Ltd, a United Kingdom company which distributes mounting and laminating equipment and supplies, for a combination of cash and stock valued at 2.6 mln dlrs, based on current exchange rates. Seal said it will pay up to an additional 1.3 mln dlrs contingent on the market price of Seal's common on December 31, 1988, and on certain earnings targets by the acquired business.