Paperclips have sloped edge to allow for easy installation (not in description)

Paperclips have sloped edge to allow for easy installation (not in description). However, this causes them grab other papers when placed in a stack, causing the clips to come off or inadvertently combine with other papers setting on them. Almost lost a number of invoices because of it when filing. Threw the clips out - worthless to me. Why change a tried and true design that's been around for over 100 years?

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