MANGUM. Okla. - Sheriff lt;.Jack Nelson, about 45. and his | daughter, .Jackie. 14, are report- i ed improved in the Mangum Hos- | pital Monday following injuries Sunday morning when their car overturned during a high-speed j chase.The Greer Countv sheriff suf-fered facial and head injuries and his daughter suffered a broken collarbone when the sheriff's car, a 1961 Oldsmobile sedan. overturned two times about six miles north of Mangum.The mishap occurred about I10 30 a.m. Sundav when Sheriff*Nelson and his daughter, who had started to Willow, about 12 miles north of Mangum on U.S. 283. stopped at a traffic signal and a red 1965 Corvair passed at a high rate of speed.'Hie sheriff began pursuit and after he had radioed his deputy, Virgil Bright, for road blocks the red car turned around in the road and when Nelson applied his brakes his car overturned twice. Bright later arrested three men in a red automobile driven by an airman from Altus Air Force Base. Trooper DeWayne Nelson of Sayre, Okla., of the Oklahoma Highway Patrol, was called into the investigation since it involved the sheriff.Sheriff Nelson and his daugh- j ter were taken to the Mangum Hospital in an ambulance of the ! Johnson Funeral Home of Mangum.