Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Corporation The idea for the product came from a frustrating experience he often had while singing in his church choir.
便签贴纸是二十年前由ArtFry，这位在3M公事上班的科学家发明的。产品的创意源自他在唱诗班唱歌时的受挫经历。
Used for this product fils for testing the even degree of one -metre -length(1/2m, 1/3m)lap and the actual length of lap at the same time.
用于测定棉卷一米（或码）长度片段的均匀情况，实际长度，核算棉卷的伸长率。 。
Used for this product fils for testing the even degree of one -metre -length(1/2m, 1/3m)lap and the actual length of lap at the same time.
用于测定棉卷一米（或码）长度片段的均匀情况，实际长度，核算棉卷的伸长率。 。
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