单词	ratchet brace
释义	Ratchet brace (Mech.) a boring brace, having a ratchet wheel and pawl for rotating the tool by back and forth movements of the brace handle. See also: Ratchet ratchet brace ratchet brace ratchet brace A brace, 3 with a ratchet-driven chuck, permitting its use in confined spaces where complete circular sweeps of an ordinary brace would be impossible.
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