Did You Know...
...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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| Number | Title | Issue Date |
| 5685765 | Machine for grinding rotor blades provided with a rotor supporting device A machine designed to grind the rotor blades of aeronautical engines includes a bench with a sliding table which holds the rotor supports. The rotor supports include a side stand point and a side stand counterpoint, both of which are combined with a bridg... | 11/11/1997 |
