Sewer pipe-line systems

Child Classifications

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• E03F 3/02 Arrangement of sewer pipe-lines or pipe-line systems
• E03F 3/04 Pipes or fittings specially adapted to sewers (manufacture of concrete tubes B28; pipes or pipe fittings in general F16L)
• E03F 3/06 Methods of, or installations for, laying sewer pipes (making pipes in situ F16L1/038 )