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The ornamental design for a road marker device, as shown and described.
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FIG. 1 is an upper perspective view of a road marker device showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a right side elevational view thereof.
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| D565447, | Sep 26 2006 | Horng-Tsung, Horng; Fu-Yuan, Chen; Chi-Sung, Wu; HORNG, HORNG-TSUNG; CHEN, FU-YUAN; WU, CHI-SUNG | Solar warning light |
| D969652, | Apr 13 2020 | Fence Post, LLC | Networked road marker |
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