Semi-automatics are the result of the Achilles Gaggia patent in 1938 that mated an electric pump system to the espresso machine. It matched the pressure created by the manuals and enabled the masses to make high quality espresso in the home. Like the manual machines it has a portafilter handle that you fill with coffee, but it uses the pump to create the pressure instead of your arm power. A pump is very consistent in its delivery. It is this consistency that is so important to each extraction (brew).
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