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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3/00
Sheets temporarily attached together involving perforations; Means therefor; Sheet details therefor
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B42F3/003
Perforated or punched sheets
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