SIEBE COMPLETES ACQUISTION OF RANCO <RNI> <Siebe Plc> of the U.K. said it completed the acquisition of Ranco Inc, following approval by Ranco shareholders. According to the terms of the deal, Ranco holders will receive 40 dlrs a share in cash. Ranco will be transferred to one of Siebe's U.S. subsidiaries, Robertshaw Controls Co. Ranco produces automatic control devices and power controls that regulate temperature, pressure, time sequencing, current, fluid flow and humidity. Its Teccor unit makes a specialized line of semiconductors.