| 摘要 |
Disclosed herein is an improved pumping system for self-contained and, if desirable, portable machines adapted to efficiently spray or squeegee viscous sealing fluids on roadway pavement and parking lots, which fluids may contain suspended solid matter. For example, this fluid pumping assembly is especially suitable for spraying asphaltic or coal-tar-pitch emulsions containing sand onto asphalt road surfaces. Also disclosed is an improved hydraulic drive cylinder assembly and control means therefor employing an improved electrically controlled hydraulically operated drive network.
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