Encara no tenim significats per a "main piston".
1She rested her hand on the main piston control, saw Eric staring at her.
2What is the relative motion of the main piston and the steam valves for inside admission, and, on the other hand, for outside admission?
33 gives the details of the pneumatic connection between the main piston and the hammer, in which packing and packing glands are dispensed with.
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