Filter sludge remover

作者: Charles J Giallanza

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参考文章(6)
Arthur E Rickerd, Vat-cleaning apparatus. ,(1905)
Force John Wilmington, Tank-cleaning device ,(1924)
Edward F Stevens, Featherston H Allen, Tank cleaning device ,(1936)
Valerius Theodore L, Olaf Larsen, Ice-cream freezer ,(1906)