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 |
| 6158697 | Railroad frog assembly with latch holdback A railroad frog assembly is provided with a spring wing rail latch holdback subassembly that continuously retains the spring wing rail in a spring wing rail fully open position when activated by the wheels of a railcar traversing the frog assembly, and th... | 12/12/2000 |
| 4917339 | Reversing device for swivelable rails or movable frogs within the crossing area of a railway switch In a reversing device for rails which are swivelable around a swivelling axis, or for movable frogs within the crossing area of a railway switch, the swivelable rails or, respectively, the movable frogs are supported in their position being in alignment w... | 04/17/1990 |
| 3977635 | Railway switch for Vignoles rails Railway switch for Vignoles rails, comprising a frog tip and wing rails arranged for swivelling movement, each of the wing rails engaging the frog tip in a respective end position and being supported in this position by supporting members resting against ... | 08/31/1976 |
