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1.  A simple, reliable, and ecologically safe design of the drive of a submersible pump and associated devices was developed and thoroughly tested for wide modernization of existing and designing new dredges.
2.  The introduction of dredges with an additional submersible pump makes it possible to increase the depth of excavation, to increase the concentration of the mixture and productivity with a decrease of specific energy expenditures and equipment wear and increase of ecological protection.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 1, pp. 43–46, January, 1994.  相似文献   
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