[…] loose-leaf paper was invented in 1854, Kenneth J. Russo and George Block didn’t patent paper hole reinforcements until 1992. Today, the ...

Comment on 10 Really Great American Patents by Top 10 Intriguing Origins Of School Supplies – Khu Phim

By KOSSAI 3:46 AM 0 comments

[…] loose-leaf paper was invented in 1854, Kenneth J. Russo and George Block didn’t patent paper hole reinforcements until 1992. Today, the circular adhesive labels with punched-out centers […]



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