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Maintenance requirements for protective relaying and control system switchgear for 0.4-35 kV networks
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Safety valves. Selection, installation and calculation
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Regulatory document. Water hardness. Measurement technique using trilon B titrimetric method
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Freight slings for general use on a textile basis. Requirements for the device and safe operation
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Technological design standards. Urban and rural telephone networks (NTP 112-2000)
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Instructions for maintenance of navigation equipment of marine approach channels and harbour areas
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