Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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clam shell coverer

A machine used in edition binding to apply paper covers to side stitched books that are not rounded and backed. The machine glues the spine, rolls or presses the cover onto it, and carries the book to the cover breaker where the back and both sides along the spine are pressed by formers. Book sizes handled range from a minimum of 7 by 5 inches to a maximum of 12 by 9 inches, and up to 1 1/8 inches in thickness (with a special attachment for books up to 2 inches thick), at speeds up to 160 books per minute. (320 )

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