Dallas R.Blair Sr.;66;of 114 Wood St.;Belle Vernon;died Wednesday Nov.23;1966;at 5:30 p.m.in Charleroi-Monessen Hospital.  Mr.Blair was a machinist at the Monessen plant of Pittsburgh Steel Co.  He is survived by his widow;Edith (Roley) Blair;three sons;Dallas Jr.;David and Jack of Belle Vernon;five grandchildren;and an aunt;Mrs.Hilda Houseman of Belle Vernon.Friends are being received at the Harold R.Toner Funeral Home;Belle Vernon;from 2 to 5 an 7 to 10 p.m.   Private funeral service there Saturday;Nov.26;at 2 p.m. with the Rev.S.Arthur Talman;pastor of Belle Vernon’s First Presbyterian Church;officiating.  Interment;Belle Vernon Cemetery.  Harold R.Toner;funeral director.