Fog dispersion device
作者： Robert E Stilwell , Dean T Mcdonald
DOI:
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摘要:
lens.org 参考文章(3)
Westover Dwight G, Larson Wyman L, Combined toy and water sprinkling device ,(1958)
Gerald C Kohl, Self-retracting nozzle unit for subsurface water sprinkler systems ,(1957)
Ernest J Sweetland, Lawn sprinkling means and system ,(1930)