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			 The ornamental design for an intercom master station, as shown and described.                                                                  | 
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FIG. 1 is a perspective view of the intercom master station showing our new design;
FIG. 2 is a left side elevational view of the intercom master station shown in FIG. 1;
FIG. 3 is a top plan view of the intercom master station of FIG. 1;
FIG. 4 is a front elevational view of the intercom master station of FIG. 1;
FIG. 5 is a right side elevational view of the intercom master station of FIG. 1;
FIG. 6 is a rear elevational view of the intercom master station of FIG. 1; and,
FIG. 7 is a bottom plan view of the intercom master station of FIG. 1.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Dec 13 1996 | KATO, TETUAKI | AIPHONE CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 008414 | /0557 | |
| Dec 13 1996 | HOTTA, TOSHIO | AIPHONE CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 008414 | /0557 | |
| Dec 25 1996 | Aiphone Co., Ltd. | (assignment on the face of the patent) | / | 
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