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The ornamental design for a pressure regulator, as shown. |
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FIG. 1 is a front view of a pressure regulator showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a bottom view thereof; and,
FIG. 5 is an isometric view thereof.
Matusek, Steven M., Garrard, James H.
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