FIG. 1 is a front perspective view of a first version of our design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a bottom plan view;
FIG. 6 is a cross sectional view taken along the line 6-6 of FIG. 2;
FIG. 7 is an enlarged fragmentary cross sectional view taken from FIG. 6;
FIG. 8 is a left side plan view;
FIG. 9 is a right side plan view;
FIG. 10 is a cross sectional view taken along the line 10-10 of FIG. 2;
FIG. 11 is an enlarged fragmentary cross sectional view taken from FIG. 10;
FIG. 12 is a front perspective view of a second version of our design;
FIG. 13 is a front elevational view;
FIG. 14 is a rear elevational view;
FIG. 15 is a top plan view;
FIG. 16 is a bottom plan view;
FIG. 17 is a cross sectional view taken along the line 17-17 of FIG. 13;
FIG. 18 is an enlarged fragmentary cross sectional view taken from FIG. 17;
FIG. 19 is a left side plan view;
FIG. 20 is a right side plan view; and
FIG. 21 is a cross sectional view taken along the line 21-21 of FIG. 13;
FIG. 22 is an enlarged fragmentary cross sectional view taken from FIG. 21;
FIG. 23 is a front perspective view of a third version of our design;
FIG. 24 is a front elevational view;
FIG. 25 is a rear elevational view;
FIG. 26 is a top plan view;
FIG. 27 is a bottom plan view;
FIG. 28 is a cross sectional view taken along the line 28-28 of FIG. 24;
FIG. 29 is an enlarged fragmentary cross sectional view taken from FIG. 28;
FIG. 30 is a left side plan view;
FIG. 31 is a right side plan view; and
FIG. 32 is a cross sectional view taken along the line 32-32 of FIG. 24;
FIG. 33 is an enlarged fragmentary cross sectional view taken from FIG. 32;
FIG. 34 is a front perspective view of a fourth version of our design;
FIG. 35 is a front elevational view;
FIG. 36 is a rear elevational view;
FIG. 37 is a top plan view;
FIG. 38 is a bottom plan view;
FIG. 39 is a cross sectional view taken along the line 39-39 of FIG. 35;
FIG. 40 is an enlarged fragmentary cross sectional view taken from FIG. 39;
FIG. 41 is a left side plan view;
FIG. 42 is a right side plan view;
FIG. 43 is a cross sectional view taken along the line 43-43 of FIG. 35; and,
FIG. 44 is an enlarged fragmentary cross sectional view taken from FIG. 43.
The dashed lines in the drawings are for environment and form no part of the claimed design.