By the time Braden retired in 1921 , ONG owned over 1,300 miles ( 2,100 km ) of lines .
By the time Braden retired in 1921 , ONG served over a half million customers in 48 of the state 's 77 counties .
By the time Braden retired in 1921 , ONG owned over 1,300 miles ( 2,100 km ) of lines and served over a half million customers in 48 of the state 's 77 counties .