Jack: Difference between revisions

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n.) A mechanical contrivance, an auxiliary machine, or a subordinate part of a machine, rendering convenient service, and often supplying the place of a boy or attendant who was commonly called Jack
n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught.

Latest revision as of 14:39, 3 June 2024

n.) A hood or other device placed over a chimney or vent pipe, to prevent a back draught.