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 |
| 7198200 | Biblock or multiblock transverse member and method for the production thereof A biblock or multiblock transverse member is provided with concrete blocks which includes plates connected to each other with the aid of an incorporated reinforcement elements. The transverse member consists of many individual prefabricated blocks whose two reinforc... | 04/03/2007 |
| 4221330 | Center butt tie connector A compound cross tie for railroad use, the method of making it, and a joiner used therein. The cross tie comprises a pair of wooden end members connected axially by the joiner, and a compressional member traversing the entire assembly: means are provided ... | 09/09/1980 |
