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One who doubles.
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An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.
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(structural engineering) A metal plate riveted or welded over a preexisting metal structural component to reinforce it and relieve the stress on the preexisting component, or to serve as a patch where part of the original structure has failed or been removed.
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Part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.
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(calico printing) A blanket or felt placed between the fabric and the printing table or cylinder.
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(metalworking) A person employed in a roller mill to fold the hot metal plates in half.
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A device with two electrical plugs that plugs into an electrical outlet, effectively converting the electrical outlet into two; socket converter.
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A diaper insert.