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The ornamental design for pipe coupling plug, as shown and described.
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FIG. 1 is a perspective view taken from the top, front and left side of a pipe coupling socket showing our new design;
FIG. 2 is a front elevational view thereof, the rear being a mirror image of the front;
FIG. 3 is a top plan view thereof, the bottom being a mirror image of the top;
FIG. 4 is a left side elevational view thereof; and,
FIG. 5 is a right side elevational view thereof.
Gotoh, Kunihiko, Kitagawa, Hiroyuki
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Nov 22 2002 | GOTOH, KUNIHIKO | NITTO KOHKI CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 013587 | /0617 | |
| Nov 22 2002 | KITAGAWA, HIROYUKI | NITTO KOHKI CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 013587 | /0617 | |
| Dec 17 2002 | Nitto Kohki Co., Ltd. | (assignment on the face of the patent) | / |
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