Headphone demonstration unit

The ornamental design for a head phone demonstration unit, as shown.

FIG. 1 is a top perspective view from the front of the headphone demonstration unit, showing my new design;

FIG. 2 is an underside perspective view from the rear of the unit of FIG. 1, and

FIG. 3 is a section along the line 3--3 in FIG. 1.

Patent	Priority	Assignee	Title
D296736,	Jun 17 1985		Headset holder

Patent	Priority	Assignee	Title
2094681,
4047109,	Sep 10 1974		Drive-in theater audio system
4097111,	Jun 01 1976	The Murdock Corporation	Electrical connector
219984,
D243620,	Sep 17 1975		Listening center
D248908,	Dec 07 1976		Coat rack

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