11.  Brothers Gourmet Coffees Inc., Boca Raton, Fla., named David B. Vermylen, its president and chief executive, to the additional position of chairman.

12.  Brothers Gourmet Coffees Inc., Boca Raton, Fla., named David Vermylen, its president and chief executive, to the additional position of chairman.

13.  Chief Executive Percy Barnevik will take on the additional position of overall chairman of the merged company, replacing co-chairmen Peter Wallenberg and David de Pury who resign.

14.  CINCINNATI STOCK EXCHANGE, an electronic stock exchange with headquarters in Chicago, named David Colker, its chief operating officer, to the additional position of president.

15.  Cobra Industries, Goshen, Ind., named Thomas DeNova, its president and chief operating officer, to the additional positions of chairman and chief executive.

16.  Cooper Industries, Houston, named H. John Riley Jr., its president, to the additional position of chief executive.

17.  Digital Equipment Corp., Maynard, Mass., named Robert Palmer, its president and chief executive, to the additional position of chairman.

18.  ENRON OIL AND GAS CO., Houston, named Mark Papa, its president of North American operations, to the additional position of president.

19.  EXTREME TECHNOLOGIES INC., Santa Ana, Calif., named its chairman, Scott Mednick, to the additional position of chief executive.

20.  FM Properties Inc., New Orleans, named Richard C. Adkerson, its chairman, to the additional positions of president and chief executive.