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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.

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Class 15/257.073 - Including means limiting immersion of penpoint


Subclass of Class 15 - Brushing, scrubbing, and general cleaning
Definition: Apparatus which includes gauge means adapted to contact
No. of patents: 0


 
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