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index plate

noun, Machinery
a plate perforated with rows of different numbers of equally spaced holes as a guide for indexing work.
Origin of index plate
1815-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for index plate
  • The index plate is calibrated by placing the recorder pen at zero position on the recorder and locking it there.

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