537,845. Books; bookbinding; filing papers. APELBAUM. L. Dec. 8, 1939, No. 31836. [Classes 16 and 146 (i)] Sheets of cardboard or stiff paper, bound up with perodicals are subdivided by perforations into printed parts to act as filing cards. Each part may have two or more holes for filing purposes. The parts may vary in size and 'the sheets may be of different colours. As shown, a sheet is divided into three parts a ... c by perforations d leaving portions f which remain in the periodical. These portions may be dispensed with and the cards then terminate at the edges of the sheet. Two or more perforations e may be provided for each part. The sheets may be bound in the periodical or stuck on to narrow strips bound in.
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