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| Number | Title | Issue Date |
| 6138921 | Mechanism for securing rails of railways on wooden sleepers A rail-to-wood sleeper fastening mechanism in railroads, consisted of a clamp having an upper and middle branch fixed to the lower face of a sleeper, and with a pair of lateral and hinged branches, constituting the clamp, going through the sleeper via chi... | 10/31/2000 |
