Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5076702 | Installation for extracting granular material in a predetermined composition, method using that installation, a mixing unit, and means of measuring the water content of granular material A floating vessel which can move about a sand pit mounts apparatus for garing granular material at the bottom of the sand pit, for processing the granular material into a mixture of a desired granular composition, and for delivery to a barge which can tr... | 12/31/1991 |
