My grandpa designed and patented the "overshot" stacker to put hay up on top of a stack, when he lived in Iowa. The stacker was all made out of wood, mostly 4X6 timbers.
John Deere found out about it and came to him and bought the patent rights to the stacker - then came back and took the stacker that he had made, claiming that it was part of the deal - and warned him not to make his own stacker as they owned the patent now.
When he moved to ND in 1918, he figured that he was far enough away from JD so it was safe to make his own stacker again. He also made a stacker for two of his sons (one was for my Dad). We used it until Dad bought the Case wire tire baler in 1948. Dad dismantled the stacker later and used the lumber elsewhere.