Ernest C. Boswell Sr., 69, founder of Ernie's Lock Co. in Riverdale, was killed Friday in an auto accident in Hampshire County, W. Va.

State police said he was the driver of one of the cars involved in a two-car collision. One person in the other car also died. Five persons, including Mr. Boswell's granddaughter, Lorretta See, 18, and her friend, Joe Ashton, 19, both of Hyattsville, were hospitalized in Winchester, Va.

Mr. Boswell, who retired from his lock company in 1973, had moved to Augusta, W. Va., four years ago.

He was born in Washington. He worked for Call Carl and other automotive firms and during World War II for the former Engineering Research Corp. in Riverdale. He was a licensed pilot.

Mr. Boswell later became a master locksmith and established his own business in Hyattsville in 1960. The company moved to Riverdale in 1974 and is now owned by a son, Harold W.

Mr. Boswell was a charter member of College Park Moose Lodge No. 453, reaching the rank of fellowship.

In addition, to his son, survivors include his wife, Elsia, of Augusta; three other children, Connie Buckey, William, and Ernest C., all of Riverdale; a brother, Edward, of Edgewater, Md., and 11 grandchildren.