US D379521 S
FIG. 1 is a top and front perspective view of the tissue culture flask;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a back elevational view thereof; and,
FIG. 6 is a bottom plan view thereof.