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Usually has a built-in gasoline engine as prime mover, flushing being
provided by the exhaust gases or by compressed air produced in the
machine. Total weight varies between 50 lb and 120 lb (22.7 kg and 54.4
kg). Motor hammer drills are used for odd-job operations, on forest roads,
in prospecting, etc., where it is not worthwhile to lay air supply lines
on account of transport difficulties or insufficient volume of work.
Fraenkel
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