| 摘要 |
<p>937,597. Sewage treatment. MEAD CORPORATION. Feb. 14, 1962, No. 5705/62. Class 46. A site for bacteria in a sewage treatment plant comprises an assembly of alternate flat and fluted elements 13 and 14 respectively joined together at areas of contact and forming a shaped insert. Examples of materials used and shapes of inserts are given.</p> |
