Robert Harsha Davidson, 92, an employe of the Chesapeake & Potomac Telephone Co. for 42 years before retiring as its news service manager in 1955, died of pneumonia Jan. 8 at the Rockville Nursing Home. He lived in Bethesda.

Mr. Davidson was a native of Tecumseh, Neb., and attended Milliken University in Illinois. He served in the Army during World War I.

In 1913, he moved to this area and joined C&P as an installer's helper. He became news service manager about 1930. In addition to his work with C&P, he had been a public relations volunteer with the old Community Chest, the American Red Cross, the Tuberculosis Association and the Society for the Prevention of Blindness.

He was a director of the National Press Club and a member of the Advertising Club, the Bethesda-Chevy Chase Rotary Club and the Kenwood Golf and Country Club. He was a member of the Alexander Graham Bell Chapter of the Telephone Pioneers of America and helped organize the C&P Glee Club.

His wife of 53 years, Elsie Davidson, died in 1972.

Survivors include a son, Robert, of Bethesda; two sisters, Ruth Deringer of Provo, Utah, and Melissa Cuaz of Denver; four grandchildren, and one great-grandchild.