I recently discovered a number of old tractor pictures in my Grandfather's boxes. Carl Rolen worked for Hart-Parr, HP-Oliver and Oliver in the 20s and 30s.  He was sales/service in Minnesota and the Dakotas.  (He became a top sales manager) If the folks on this forum are interested, I'll transfer the negatives to photos and post them.  (One picture was an Oliver 70 with the caption &quot;First dual tires Oliver 70&quot;)   The attached is a  tiptoe wheel Hart-Parr Oliver Hugh