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 16 Aug. 2022.
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