No, a seesaw is an example of a "lever".
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Wedge
Whether or not a mill is an example of a wheel and axle is a matter of semantics. It certainly would contain examples of a wheel and axle.
A wheel barrow is one example
A wheelbarrow is an example of a class 2 lever as well as a wheel and axle. A wedge is an example of an inclined plane.
You could say a bike wheel is a wheel and axle. Also a doorknob is a wheel and axle.
Can opener
a doorknob
A tire
A cycle
yes of course