US D246671 S
FIG. 1 is a perspective view of a mouthpiece block for underwater breathing apparatus showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is an elevation as seen from the right of FIG. 2;
FIG. 4 is an end elevation thereof;
FIG. 5 is a cross section taken on line 5--5 of FIG. 3;
FIG. 6 is a cross section taken on line 6--6 of FIG. 3; and,
FIG. 7 is a cross section taken on line 7--7 of FIG. 5.
The broken lines are shown for illustrative purposes only.