BUFFTON CORP <BUFF> BUYS B AND D INSTRUMENTS Buffton Corp said it completed the purchase of B and D Industruments Inc for two mln dlrs cash and 400,000 shares of common stock. It said B and D is a private company headquartered in Kansas, and had sales of 4,700,000 dlrs in 1986. Buffton said the company designs and manufactures aviation computer display systems and engine instrumentation.