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I claim the ornamental design for a contact sensor, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| May 30 2013 | WANG, RENDA | ISMART ALARM, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030628 | /0098 | |
| Jun 06 2013 | iSmart Alarm, Inc. | (assignment on the face of the patent) | / |
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