Answer:
-jackhammer
a hand-held hammer drill, driven by compressed air, for drilling rocks, etc
-jointer
a tool for pointing mortar joints, as in brickwork
-jumper
a boring tool that works by repeated impact, such as a steel bit in a hammer drill used in boring rock
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Answers & Comments
Answer:
-jackhammer
a hand-held hammer drill, driven by compressed air, for drilling rocks, etc
-jointer
a tool for pointing mortar joints, as in brickwork
-jumper
a boring tool that works by repeated impact, such as a steel bit in a hammer drill used in boring rock