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roller-backer

noun
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Definition of roller-backer

: a machine that backs a book by a roller action and forms shoulders but does not round the book except as the rollers perfect the round already imparted — compare rounder and backer

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“Roller-backer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/roller-backer. Accessed 14 Jun. 2021.

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