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...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.

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Class 55 - Gas separation

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282 Subclasses


Subclasses list

Definition

Lines with other classes and within this class

Class 55 is an integral part of Class 96 and follows subclass 429 in Class 96 in the schedule hierarchy. Class 55 uses the class definition and class lines established in and for Class 96. Class 55 provides for the gas separation apparatus that has not yet been reclassified.
 
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