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 |
| 4390070 | Soil working machine A machine for cultivating the soil has a main transverse beam carrying a transverse tool-shaft driven to drive wobble bearings on the tool-shaft, thereby to oscillate a plurality of tool holders having lever arms guided for transverse swinging movement in... | 06/28/1983 |
| 4235294 | Soil cultivating machine A machine for cultivating the soil has a main transverse beam carrying a transverse tool shaft driven to drive wobble bearings on the tool shaft, thereby to oscillate a plurality of tool holders having lever arms guided for transverse swinging movement in... | 11/25/1980 |
| 4202415 | Soil cultivating machine A machine for cultivating the soil has a main transverse beam carrying a transverse tool shaft, and a gear box for driving the tool shaft. The beam has a frame for attaching the machine to the conventional three-point hydraulic system of a tractor, the tr... | 05/13/1980 |
