External ring clamp

The ornamental design for an external ring clamp, as shown.

FIG. 1 is a perspective view of an external ring clamp showing my new design.

FIG. 2 is a side elevational view of FIG. 1, the opposite side being a mirror image thereof.

FIG. 3 is a bottom plan view of FIG. 1; and

FIG. 4 is a right end elevational view of FIG. 1.

Patent	Priority	Assignee	Title
D255715,	Oct 10 1978		Surgical clamp
D742211,	Jul 31 2013	EURO TOOL, INC.	Jewelry ring clamp with round wedge

Patent	Priority	Assignee	Title
3996650,	Sep 29 1975		Film retainer member for solar heater chamber

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