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- We investigate how machine designers increased the operational capacity of their machines by introducing pump pressure to replace steam pressure.
- We look at the first piston machines that used a threaded screw to help push water through the puck.
- We learn that by the end of the 1940s, machines became more ergonomic and levers were adopted, achieving more than 9 bars of pressure.
- We find out how and when the first electric rotary pumps were introduced, giving birth to the modern espresso era in the late ’50s.
