You can visit this interesting museum free of admission upon reservation.  The museum is open from Tuesday to Saturday 9:30-15:00.
Here, you can find various historical machines since its invention and going through the evolution of Vending machine to the most recent cutting-edge technology machine. 
When you enter, you will encounter the most ancient coin operated water dispenser.  This "Holy water dispenser" is believed to be the first vending machine ever invented, which is found in a book by Heron, a scientist of Alexandria in ancient Egypt.  It was placed in the temple of Alessandria to provide equal quantity of holy water without the presence of a priest. 
For more information about SandenVendo Vending machine, visit product page!