The pin which passes through a key of the keyboard and on which the key plays as on a pivot or centre so that when the front of the key is depressed by the finger the part on the other side of the pin, called the key-tail, rises. In each key One, such pin is inserted.
Hydraulic machines are machinery and tools that use liquid fluid power to do simple work, operated by the use of hydraulics, where a liquid is a powering medium.
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