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The ornamental design for a concrete hammer, as shown. |
FIG. 1 is a front, top and right side perspective view of a concrete hammer showing our new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
Watanabe, Satoru, Sakamoto, Masakazu
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 28 1992 | WATANABE, SATORU | Ryobi LTD | ASSIGNMENT OF ASSIGNORS INTEREST | 006053 | /0092 | |
Feb 28 1992 | SAKAMOTO, MASAKAZU | Ryobi LTD | ASSIGNMENT OF ASSIGNORS INTEREST | 006053 | /0092 | |
Mar 13 1992 | Ryobi Ltd. | (assignment on the face of the patent) | / |
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