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			 The ornamental design for a box clamp for automobile body straightening unit, as shown and described.  | 
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FIG. 1 is a perspective view of a box clamp for automobile body straightening unit showing our new design;
FIG. 2 is a side elevational view thereof with the movable jaw in an open position;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front end elevational view thereof;
FIG. 5 is a rear end elevational view thereof;
FIG. 6 is a top plan view of the movable jaw shown separately for ease of illustration;
FIG. 7 is a bottom plan view of FIG. 6;
FIG. 8 is a top plan view of the stationary jaw also shown separately for ease of illustration.
Hinson, Virgil H., Jarman, Davis R.
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