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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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7/00
Filing appliances without fastening means
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B42F7/06
Filing appliances comprising a plurality of pockets or compartments, e.g.; portfolios or cases with a plurality of compartments
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B42F7/08
expansible
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