Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
Load children
B42
BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
Load children
B42F
SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
Load children
21/00
Indexing means; Indexing tabs or protectors therefor
Load children Filter patents View analytics View as hierarchy
B42F21/04
Tabs permanently fastened to sheets, papers, cards, or suspension files
Load children Filter patents View analytics View as hierarchy
B42F21/045
for suspension files
Filter patents View analytics View as hierarchy