Rear portion of a percussive high frequency chest wall oscillation system

FIG. 1 is a front perspective view of a rear portion of a percussive high frequency chest wall oscillation system in accordance with the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the rear portion of the percussive high frequency chest wall oscillation system and form no part of the claimed design.