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| Number | Title | Issue Date |
| 5486136 | Cutting machine for railroad rail A cutting machine for a railroad rail performs clamping by use of a screw to fasten a catch arm onto a gauge which indicates a cutting position and is fastened onto a railroad rail. The catch frame is connected to a main body block via slide shafts, and a... | 01/23/1996 |
| 5457866 | Bolt-tightening method using an impact wrench The present invention provides an impact wrench and a bolt-tightening method such that a spring force is applied, through the circumference of a spindle coupled with the output shaft of an electric motor, in the forward direction to a hammer which is capa... | 10/17/1995 |
| 5409328 | Drilling machine for railroad rail A drilling machine for a railroad rail, in which the railroad rail is clamped crosswise with respect to a main body case by a catch frame and a clamp arm, includes a cutter advanced perpendicularly with respect to the middle part of the rail by turning th... | 04/25/1995 |
