Control knob

[0001]FIG. 1 is a front perspective view of a set of control knobs in which environment comprising a treadmill is disclaimed control knob;

[0002]FIG. 2 is a back perspective view thereof;

[0003]FIG. 3 is a front view thereof;

[0004]FIG. 4 is a back view thereof;

[0005]FIG. 5 is a left-side view thereof;

[0006]FIG. 6 is a right-side view thereof;

[0007]FIG. 7 is a top view thereof;

[0008]FIG. 8 is a bottom view thereof;

[0009]FIG. 9 is an enlarged front perspective view of one of the control knobswith the disclaimed environment removed for clarity of disclosure. The claimed design includes the mirror image of the control knob depicted that is not shown;

[0010]FIG. 10 is an enlarged back perspective view thereof;

[0011]FIG. 11 is an enlarged top view thereof;

[0012]FIG. 12 is an enlarged bottom view thereof;

[0013]FIG. 13 is an enlarged left-side view thereof. The expanded right-side view is identical to the expanded left-side view; and,

[0014]FIG. 14 is an enlarged front view thereof.

[0015]FIG. 15 is front perspective view of a control knob;

[0016]FIG. 16 is a back perspective view thereof;

[0017]FIG. 17 is a front view thereof;

[0018]FIG. 18 is a back view thereof;

[0019]FIG. 19 is a left-side view thereof;

[0020]FIG. 20 is a right-side view thereof;

[0021]FIG. 21 is a top view thereof; and

[0022]FIG. 22 is a bottom view thereof.

[0023]The broken lines depict portions of the treadmill or portions thereof and/or environment of the treadmill or portions thereof which in the drawings illustrate portions of an environmental treadmill and portions of control knob that form no part of the claimed design.