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perforating rule

noun
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Definition of perforating rule

: a notched steel or brass printer's rule a little more than type high used for making perforations

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“Perforating rule.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/perforating%20rule. Accessed 10 December 2019.

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