很多人都会将回形针归为伟大的发明（相似的还有拉链，易拉罐等等），但你了解历史吗，回形针第一次出现（那时候未必是回型）是什么时候呢，为什么它有这么多类型？wikipedia上不了，就看这：Early Office Museum（The Early Office Museum™engages in research on the history and evolution of offices, antique office machines and equipment, and business technology based on original documents, artifacts, and photographs。值得收藏）。(via:designboom weblog)
