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			 The ornamental design for a slidable tray insert for a mailbox, as shown.  | 
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FIG. 1 is a top, front and right side perspective view of a slidable tray insert for a mailbox showing our new design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a right side elevational view;
FIG. 6 is a left side elevational view; and
FIG. 7 is a bottom plan view thereof.
Harlow, Jr., Albert L., Felske, Arthur M.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Feb 15 1985 | EZ Mail Corporation | (assignment on the face of the patent) | / | |||
| May 13 1986 | HARLOW, ALBERT L JR | EZ Mail Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 004565 | /0266 | |
| May 13 1986 | FELSKE, ARTHUR M | EZ Mail Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 004565 | /0266 | |
| Feb 12 2002 | Flambeau Products Corporation | LASALLE BANK NATIONAL ASSOCIATION, AS AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 012598 | /0340 | 
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