Carbon County Commissioner John P. Davis of Lansford has three sons in the armed forces. They are Lt. Thomas W. Davis, 27; Ensign John P. Davis Jr., 29, and Mechanic's Mate Robert J. Daivs, 20. A fourth son, Theodore P. Davis, 38, holds a vital defense position. Ted was transferred recently from Ravenna, Ohio to the Weldon Springs plant of the Atlas Powder Company near St. Louis, Mo. where he is a safety engineer in the munufacture of TNT.