Farmland common pipe ditch

LI FENGYI | European Patent Office | 2021

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Farmland buried pipe drainage system

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DRAIN PIPE AND DRAIN PIPING STRUCTURE USING THE DRAIN PIPE

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DRAIN PIPE MANAGEMENT SYSTEM, DRAIN PIPE MANAGEMENT METHOD, AND DRAIN PIPE MANAGEMENT PROGRAM

NAGAI TOSHIRO / KURIMOTO ITARU | European Patent Office | 2022