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We claim the ornamental design for a line voltage monitoring device, substantially as shown.
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FIG. 1 is a perspective view of the line voltage monitoring device of the present invention.
FIG. 2 is a front elevational view of the line voltage monitoring device.
FIG. 3 is a back elevational view of the line voltage monitoring device.
FIG. 4 is a right side elevational view of the line voltage monitoring device.
FIG. 5 is a top elevational view of the line voltage monitoring device; and,
FIG. 6 is a bottom elevational view of the line voltage monitoring device.
Allen, Jr., Philip Brown, Rollason, Bryan, Letchford, Gene
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