This defines what a rockshaft is.
The John Deere A was introduced in 1934 with hydraulics.
I suspect that the rockshaft intended to lift cultivators was a target for
Lindeman to use to lift arms for the Yakima Hitch. Can anyone verify that the
John Deere A was the first one to get a Yakima Hitch?
The Yakima Hitch tool carriers were first built for the
A, B, and G.
Lindeman was purchased by Deere in 1946.
At one time, Lindeman made single bottom plows for the
9N.
The Challenger 65 had some Lindeman involvement.
This article mentions that the War Production Board had
largely shut down Deere tractor production during WW2.
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