Filter
FIG. 1 is a top plan view of a filter showing my new design, the bottom plan view being the same as the top shown; 
     FIG. 2 is a side-elevational view of one side thereof; the opposite side being the same as the side as shown; 
     FIG. 3 is an elevational view taken from one end thereof; and 
     FIG. 4 is an elevational view taken from the end opposite that shown in FIG. 3.