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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9/00
Filing appliances with devices clamping file edges; Covers with clamping backs
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B42F9/002
combined with auxiliary devices, e.g. pencils
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B42F9/005
with auxiliary filing means
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