	rexcom rxsc to uire marketing firm rexcom systems corp said it agreed to buy all the assets of postech inc from comtech group international ltd a canadian computer service company for pct of rexcom s voting shares the purchase will be for rexcom common and preferred stock postech the canadian firm s u s marketing arm sells computerized restaurant management systems and security systems in the u s the deal is subject to approval by the boards of postech and rexcom reuter 
