Binder clips. "The binder clip was invented in 1910 by Washington resident Louis E. Baltzley, who ultimately was granted U.S. Patent 1,139,627 for his inventio

Binder clips. "The binder clip was invented in 1910 by Washington resident Louis E. Baltzley, who ultimately was granted U.S. Patent 1,139,627 for his invention." https://en.wikipedia.org/wiki/Binder_clip https://en.wikipedia.org/wiki/Binder_clip