Maybe I can be of some help. When the Oliver 70 rolled out in 1935 as far as modern design there wasn&#039;t much competition. The 70 sported a six cylinder that had a drawbar hp. at 21, a spring and hammock seat, finger tip controls and modern appearance. 

There were other tractor companies that competed for the farmers dollar. For example:
John Deere General Purpose B a very successful 2 cyl  rated at 14 hp on the belt
John Deere A extremely successful at approx 21hp
Allis Chalmers WC  a four cyl  rated at 22 hp.
Farmall F20 &amp;amp; 30 
There were others but I would say that these were the primary competitors at the point in tractor history. Others on this board may differ or may add tractors.

Hope this helps. <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D -->