| 摘要 |
<p>739,878. Filters. LUBER-FINER, Inc. April 20, 1954, No. 11341/54. Class 46. [Also in Groups VIII, XVII and XXII] Elements 31, 32 of a filter unit are stamped out with configurations 33, 34 and with peripheral notches 40 by means of dies (see Group VIII). The filter elements are stacked alternately in a container provided with ribs which engage the notches 40 to align the filter elements.</p> |
