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Prefabricated detachable road paving
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Device for marking-out cut lines on pipe-line
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Method of determining pipeline blockage
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Acoustic method of detecting gas or liquid leaks in pressure pipe-line
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Device for skimming oil off water surface
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Apparatus for cleaning pipeline inner surface
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Apparatus for indicating location of cleaning device in pipeline
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Apparatus for repairing pipelines laid on swampy soil
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Apparatus for passing scapers through pipeline
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Method of cleaning combustible matter storage tanks
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Pipeline closing-off method
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Remote pipeline cathode protection monitoring device
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Quadripolar sensor
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