Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B42
BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
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B42B
PERMANENTLY ATTACHING TOGETHER SHEETS, QUIRES OR SIGNATURES OR PERMANENTLY ATTACHING OBJECTS THERETO
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5/00
Permanently attaching together sheets, quires or signatures otherwise than by stitching
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B42B5/08
by finger, claw or ring-like elements passing through the sheets, quires or signatures
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B42B5/10
the elements being of castellated or comb-like form
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