Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B42
BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
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B42F
SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
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13/00
Filing appliances with means for engaging perforations or slots
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B42F13/0006
Covers for loose-leaf binders
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B42F13/004
Devices for protecting or reinforcing covers, e.g. edges or corners
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