The ornamental design for a tow bar, as shown and described.
FIG. 1 is a perspective view of the tow bar of the invention, showing in broken line for purposes of background only a safety chain and attachment cotter pins.
FIG. 2 is a top plan view of the tow bar of FIG. 1.
FIG. 3 is a rear-perspective view of the tow bar of FIG. 1.
FIG. 4 is a front-perspective view of the tow bar of FIG. 1; and,
FIG. 5 is a bottom view of the tow bar of FIG. 1.
The broken line showing of details in 1–5 is included for the purpose of showing environmental portions of the tow bar and forms no part of the claimed design.