There are two machine types of commercial espresso machine and of those two vairations there are several operating types within. The following are the basic descriptions of the machines avaialble on the market.
A manual commercial espresso machine is operated by literally moving a lever with your hand. The lever controls a hydraulic piston which creates the pressure necessary to brew the espresso. Very few commercial machines exist anymore operating by this method.
A semi-automatic commercial espresso machine...
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