Hammer drill/Definition

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https://en.citizendium.org/wiki/index.php?title=Hammer_drill/Definition&printable=yes
A definition or brief description of Hammer drill.

A drill (tool) used to make holes in hard material such as stone and concrete, which moves its cutting bit in a repetitive linear motion or combined with a rotary motion; many hand power drills have selectable hammer and rotary modes. A rotary hammer is similar but usually larger

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