| 摘要 |
1,109,234. Filter. S. F. W. CRUNDALL, A. R. CRUNDALL and M. L. CRUNDALL. 13 April, 1966 [14 April, 1965], No. 15966/65. Addition to 969768. Heading B1D. The method and apparatus of Specification 969,768 are modified by making the perforate member (2) on which the solids of the sewage sludge are left of expanded metal. |
