Below are images of JD integral plows. An integral plow is meant to be pulled by the tractor which transports solely on the tractor without touching the ground unless being used.
JD introduced integral plows as early as the 1920's with the GP series tractors. Later on the A B and G models had integral plows which were lifted manually (with spring assist). Nearly every model of row-crop tractor had a corresponding integral plow. The H and L series tractors were offered with several types of integral plows.
With the introduction of the M and MT series tractors Deere offered their own type of rear hydraulic lift (rockshaft type) hitch. The reason for Deere and other companies (such as Allis-Chalmers, J.I. Case, IHC-Farmall) developed proprietary hitches since Henry Ferguson owned the patent on the 3 point hitch which is still the standard even today. Deere also offered their own design hitch (800, 801, 801A series) which closely resembled the 3 point except that the center link attached to both sides of the tractor (making it effectively a 4 point hitch).
Once the patent protection for the 3 point hitch expired John Deere offered their own 3 point hitches on model 40 tractors in 1953 and later introduced on the model 520 620 and 720 tractors in 1956. From there on the SAE Category 1 and 2 hitches would be the standard in the industry.
Integral plows were ideal to not only plow one-way but also to attach a left hand plow gang (or two gangs) for two-way plowing.
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