US D251775 S
Abstract available in
FIG. 1 is a front perspective view of a filter photometer showing our new design;
FIG. 2 is a front plan view;
FIG. 3 is a rear plan view;
FIG. 4 is a side view of FIG. 1; and
FIG. 5 is a top plan view of the design shown in FIG. 1.