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			 The ornamental design for an offset printing machine, as shown and described.  | 
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FIG. 1 is a front and right side perspective view of an offset printing machine showing our 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 left side elevational view thereof; and,
FIG. 6 is a right side elevational view thereof.
The bottom is plain and unadorned.
Hiraishi, Etsuo, Hirokawa, Katsushi, Aoyama, Hideo
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Dec 07 1992 | HIRAISHI, ETSUO | Ryobi LTD | ASSIGNMENT OF ASSIGNORS INTEREST | 006367 | /0531 | |
| Dec 07 1992 | AOYAMA, HIDEO | Ryobi LTD | ASSIGNMENT OF ASSIGNORS INTEREST | 006367 | /0531 | |
| Dec 07 1992 | HIROKAWA, KATSUSHI | Ryobi LTD | ASSIGNMENT OF ASSIGNORS INTEREST | 006367 | /0531 | |
| Dec 17 1992 | Ryobi Ltd. | (assignment on the face of the patent) | / | 
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