You CANNOT sell photos of copyright items and trademarks.
Imagine: you sell a picture of the John Deere tractor through Adobe Stock.
It is used to advertise a rival tractor (which says how much better it is than the John Deere).
John Deere sue the rival tractor company for breach of copyright and abuse of trademark.
But Adobe Stock promised all rights, so the rival tractor company sue Adobe Stock.
And YOU promised all rights, so Adobe Stock sue YOU. This could cost unlimited sums of money.
So Adobe is protecting you. You cannot use other people's copyright in your work, just as you would not want them to use YOUR copyright images in their work.
Some of these machines could be made "anonymous" by removing labels, but in some cases the very colours are trademarked.
This is of course a serious limitation on what you can photograph. People who photograph street scenes find the same problem, because everything is copyright: shop signs, coffee brands, cars, people's trainers (yes, really).