Protective lining for canals and general earthwork
作者： Edgar J Baird
DOI:
关键词: Engineering 、 Forensic engineering 、 Earthworks 、 Principal (computer security)
摘要: This invention relates to a protective lining for canals and general water-confining or waterresisting earthwork. The principal objects of the are similar those specified in my United States Patent Number 2,138,366, although constitution present procedure...
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