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 |
| 4633818 | Mobile coal-fired fluidized bed power unit A mobile coal-fired fluidized bed furnace system (10) is provided for generating steam to power a locomotive. Coal is combusted within the fluidized bed furnace chamber (30) in the fluidizing air to produce a hot flue gas which pass from the furnace chamb... | 01/06/1987 |
