Machine Design
The application of third type levers is found in

A pair of tongs
Handle of a hand pump
Lever of a loaded safety valve
Hand wheel of a punching press

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Machine Design
Cap screws are

Provided with detachable caps
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut

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