Portable back massager

The ornamental design for a portable back massager, as shown and described.

FIG. 1 represents both top and bottom plan view of a portable back massager showing my design as they are a mirror image of each other;

FIG. 2 represents both right and left side elevational views as they are a mirror image of each other.

FIG. 3 represents the front elevational view; and,

FIG. 4 represents the rear elevational view.

Patent	Priority	Assignee	Title
D820460,	Apr 03 2017	Tec-Human Integration Solutions LLC	Head-neck posture device
D841177,	Jun 29 2018		Trigger point massage device
D902422,	Jul 17 2019	Back Solutions Alternative LLC	Back massage tool
D914902,	Jul 20 2018		Therapy device
D915615,	Oct 20 2020		Massage roller
D924416,	Oct 02 2018	MTG CO , LTD	Skin massage roller
ER5055,
ER6844,
ER6893,

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