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 |
| 5524552 | Single axle truck for large railroad cars A specially designed single axle truck is designed for use on extra long railroad cars which are sixty feet or longer to accommodated bigger and heavier loads. The single axle trucks are secured to rigid subframes which, in turn, are mounted on the under ... | 06/11/1996 |
| 4586620 | Railroad car coupler alignment device An alignment device for railroad car couplers including a central flexible portion with a pair of swivelable end portions connectable between couplers of adjacent cars. Each of the end portions includes a protruding stud adapted to engage an opening prefo... | 05/06/1986 |
