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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B42F21/12
Sheets, papers, or cards having edges cut away to facilitate indexing, e.g. thumb cuts on books
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