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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21/00
Indexing means; Indexing tabs or protectors therefor
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B42F21/04
Tabs permanently fastened to sheets, papers, cards, or suspension files
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