Beltran D. Barker, 82, who owned and operated a number of Exxon gas stations here for more than 55 years, died Tuesday in Cape Cod Hospital in Massachusetts following a heart attack.

Mr. Barker, a fifth-generation Washingtonian, was one of the early black persons in Washington to become an established small businessman. He opened his first gas station, for the old Standard Oil of New Jersey, at 7th and R streets NW in 1922.

He owned a number of stations over the years, sometimes as many as three at a time, and always Exxon. In 1946, he began selling household appliances, especially television sets, at his gas stations.

Mr. Barker's last gas station was the Exxon station at 8th Street and Florida Avenue NW, which he operated until last year. Mr. Barker supervised the operation, at times worked the pumps, and sold home appliances.

Shortly before he retired in 1977 and moved to Massachusetts he was honored by Exxon "for 55 years of continuous business association."

Mr. Barker was a founding member of the United Golf Association.

He is survivied by his wife, Elizabeth Cardozo Barker, of the home in Osterville, Mass.; two sons, Julian Nicholas, of Washington, and Frank Cardozo Nicholas, of Marstons Mills, Mass.; a sister, Helen B. Williams, of Washington, and three grandchildren.