Ben Thomason, 74, who was a switchman with the C & P Telephone Company for 43 years before retiring in 1969, died of a liver ailment Saturday in his home in Arlington.

Mr. Thomason had served as president of the Alexander Graham Bell Chapter of the Telephone Pioneers of America in the mid-1970s. He also was a member of the Theodore Roosevelt Lodge No. 44 of the Masons.

He was a duck pin bowler and member of the Duck Pin Traveling League.

He was a member of Clarendon United Methodist Church. He also had been active in the Life Member Club a volunteer organization.

Mr. Thompson was born in Douglas, Ariz., and came to Washington at an early age. He was a graduate of the old Western High School and attended Benjamin Franklin University in Washington. He lived in the District of Columbia before moving to Arlington 47 years ago.

Survivors include his wife, Hattie Belle, of Arlington; two daughters, Gayle Pierce of Manassas, and Suzanne of New Carrollton; a sister, Bertha Thomason of Bethesda; two brothers, Temple, of Lutherville, Md., and Fred, of Bethesda, and two grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Clarendon United Methodist Church in Arlington.