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Method for dewatering concrete or/and reinforced concrete runway structure of railway being in tunnel particularly in metro tunnels
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Track-formation ensuring increased water-protection for city- or local-electric tracks
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Public road-railway superstructure of novel system
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Constant-path vehicle train particularly for mass communication
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Method and apparatus for sampling combustion products forming at running condition of diesel-engines particularly for determining the soot contents
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Method for keeping high-security work of current supply system free from interruption and device for implementing this method
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Track arrangement particularly for metropolitan railways
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