Pat Cannon, 53, a Navy veteran of two wars and an area car salesman for more than 20 years, died of congestive heart failure Wednesday at Suburban Hospital in Bethesda.

Mr. Cannon was a native of Washington and a graduate of St. Anthony's High School here.

He enlisted in the Navy in 1941, and served in the Atlantic and Pacific theaters during the war. He later served in Korea during the conflict there. On returning to Washington, he served as a Navy recruiter until he retired as a gunner's mate 1st class in 1955.

Mr. Cannon then worked as an auto salesman, beginning with Amatucci Chevrolet in Wheaton in 1955. He had worked the past seven years at Rockmont Motor Company Inc. in Rockville.

He had been active for many years with the Wheaton Boys Club. Mr. Cannon was a member of St. Patrick's Catholic Church in Rockville.

He is survived by his wife, Margaret A., two daughters, Laura and Theresa, and a son, Patrick, all of the home in Rockville; three other daughters, Mary-Jo, of Wheaton, and Margaret Jean and Aileen, both of Columbia, Md.; seven other sons, Kevin, of Blacksburg, Va., Danny, of Washington, David, of Frederick, Brian of Homestead, Fla., Stephen, of Silver Spring, and Michael and Matthew both of Prince Frederick, Md.; his stepmother, Clare Cannon, of Hyattsville; three sisters, Mary Ruth Dean, of Brentwood, Dolores O'Brien, of College Park, and Sister Francis Augusta, OSB, of Elizabeth, N.J., and 11 grandchildren.