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| Number | Title | Issue Date |
| 5473828 | Structure of a clamshell bucket and a hydraulic control circuit To excavate sticky soil such as clayey soil, left and right buckets of a clamshell bucket are slightly inclined, thereby reducing the force to pull the buckets from a hole. The clamshell bucket includes left and right buckets which are closable, thereby h... | 12/12/1995 |
| 5418982 | Raw sewage disposal apparatus and prefab for accommodating the same A raw sewage disposal apparatus employing a heat-resistant vessel for containing raw sewage, a plurality of stirring blades for stirring the raw sewage in the vessel, a plurality of heat-holding bodies contained in the vessel, an introduction pipe connect... | 05/30/1995 |
| 5377432 | Deep excavator A deep excavator comprising a stretchable arm arrangement having four telescopically assembled alms which are simultaneously extended and contracted for excavating earth or sand to form a deep hole. The stretchable arm arrangement houses therein a working... | 01/03/1995 |
| 5252969 | Temporary signal system A temporary signal system wherein a pair of signal stands are installed at spaced locations adjacent a traffic restriction area. Each stand has at least red and green lights which light or flash for predetermined time periods to control vehicle traffic pa... | 10/12/1993 |
| 5232232 | Mechanism for moving a heavy object A heavy object, such as a portable toilet, is supported on a base. At least one wheel is mounted on the base for vertical movement between an upper position in which the wheel is supported above the lower surface of the base and a lower position in which ... | 08/03/1993 |
| 5211259 | Lifting apparatus A lifting apparatus has a movable chassis, a vertically movable platform disposed over the chassis and a telescopic boom body connected between the chassis and the boom body and arranged to form a Z-shape in side view. An angle detector gives a signal ind... | 05/18/1993 |
| 5139110 | Lifting apparatus A lifting apparatus capable of eliminating a synchronous mechanism or an additional hydraulic cylinder with simple structure. The lifting apparatus comprises a mobile chassis, a platform disposed over the mobile chassis and capable of raising and lowering... | 08/18/1992 |
