ASIMO-TECH
By Ragu
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SECRETS OF AGING
Sunday, 4 September 2011
DRILL
An electric power drill can bore a hole in most materials by rapidly rotating a sharp bit or by pounding a bit in and out using a hammer mechanism. The hand drill and brace and bit are used mainly for woodwork.
OTHER TYPES OF DRILL
HAND DRILL
BRACE AND BIT
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