| 摘要 |
<p>PCT No. PCT/SE92/00239 Sec. 371 Date Oct. 18, 1993 Sec. 102(e) Date Oct. 18, 1993 PCT Filed Apr. 13, 1992 PCT Pub. No. WO92/18234 PCT Pub. Date Oct. 29, 1992.A gas is blown into a filter (1) having a granular filter bed such that the gas flows into the bed along at least one elongate free edge disposed in the bed.</p> |
