Spray head for lawn sprinkler systems
作者： Maness Harvey De Witt
DOI:
关键词: Lawn 、 Environmental science 、 Head (vessel) 、 Anatomy
摘要:
lens.org 参考文章(3)
Ernest J Sweetland, Adjustable lawn sprinkling means ,(1932)
Axel R Lemoon, Segmental sprinkler nozzle ,(1930)
Ray F Frye, Automatic lawn sprinkler ,(1924)