Means for raising and lowering diffuser tubes
作者： Carl H Nordell
DOI:
关键词: Optics 、 Diffuser (sewage) 、 Raising (metalworking) 、 Environmental science
摘要:
lens.org 参考文章(4)
William Smethurst, Process of treating substances with nascent carbon dioxid. ,(1902)
Weber-Stierlin Ernst, GAS-DISTRIBUTING DEVICE. ,(1910)
Carl H Nordell, Sewage treatment apparatus ,(1935)
Galen R. Showalter, Disk harrow carrier ,(1948)