The elevator in the first pic is pretty old, and probably hasn't been used for quite some time.
The wooden wheeled cart, very cool.
The planter or seeder, I have seen similar used not so long ago.
Agree with Deadlius, would be hard to put an exact date on any of it, even if you find a date on some of it, which would probably be a patend date, and could have been made then or substancially later.
Take the Bain (spoked wheel) wagon it could have been made 75 years ago, or much longer. Made by many different individuals. and similarly built for a long time. Then again maybe someone who knows more could narrow it down if looking at it.
Old stuff is cool, makes you think, life was different back then.