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The ornamental design for a ladder rail clamp, as shown and described. |
FIG. 1 is a right perspective view of a ladder rail clamp embodying my new design;
FIG. 2 is a top plan thereof;
FIG. 3 is a bottom plan thereof;
FIG. 4 is a front elevation thereof;
FIG. 5 is a rear elevation thereof;
FIG. 6 is a left side elevation thereof, with a right side elevation being a mirror image thereof.
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