John Deere jumped on the copyright bandwagon early.
I remember when I would buy a power tool or stereo and it would have a few pages at the end of the instructions that listed every part and their part number (and the instructions were written by a native english speaker)
I dont remember when this changed, but probably in the 80s.
I do remember reading a comic in Mad Magazine explaining planned obsolescence in the early 60s and being horrified as a little kid. I still have my fathers jacobsen manor 21 lawnmower, and it works great 70+ years later. same with his porter cable router and craftsmen and s&k tools

Those tractors often cultivate soybeans, a plant that is pretty much OWNED by the Monsanto company. Over time they've convinced and coerced enough farmers to use their strain of soybeans that they now totally dominate that market. Which tempts fate to blight those soybeans for not having the resilience that nature does a better job providing.
Are we having fun yet?
Do you remember when an electrical schematic was pasted to the bottom of every electronics device?