The drawing below is from Gustave Eiffel's book describing the tower that bears his name. There are 53 of them in total.
XL. Regulators of speed. Mechanism of slowdown. Coupler. Various appliances of the distribution
Another board on the elevator Fives-Lille, which has a lot. This elevator is very complex in its design and implementation, it requires a large number of schema. This one is particularly complex, it is one of the most difficult boards to understand.