Definition of rounder and backer
: a machine that accepts a book with a flat backbone, rolls it out to give concave front and convex back edges, and completes the shaping by backing — compare roller-backer
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“Rounder and backer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rounder%20and%20backer. Accessed 14 Apr. 2021.
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