McMINVILLE, Ore. (March 20)—Higher operating and unit production costs resulted in a twofold dip in third-quarter earnings for RB Rubber Products Inc. The firm reported net income of $90,000 in the period ended Jan. 31 compared to $310,000 recorded in last year´s quarter. Sales slipped slightly to $2.8 million from about $2.9 million. Nine month earnings came in at $376,000, down from $534,000, on a slight drop in sales to $8 million from $8.2 million last year. The company´s Tire Recycling Division had increased operating costs while its Matting Division was hit with increased production expenses, RB Rubber said. Costs relating to upgrading the Recycling Division´s equipment also contributed to the drop in profitability, it said.