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The ornamental design for a telephone headset amplifier, shown and described.
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FIG. 1 is a front perspective of a first embodiment of a telephone headset amplifier showing my design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a top plan elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a side elevational view thereof;
FIG. 7 is another side elevational view thereof;
FIG. 8 is a front perspective view of a second embodiment of a telephone headset amplifier showing my design;
FIG. 9 is a rear perspective view thereof;
FIG. 10 is a top plan view thereof;
FIG. 11 is a rear elevational view thereof;
FIG. 12 is a front elevational view thereof; and,
FIG. 13 is a side elevational view thereof with the other side being the same.
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| D789319, | Feb 27 2015 | UNIFY BETEILIGUNGSVERWALTUNG GMBH & CO KG | Key module |
| D789320, | Feb 27 2015 | UNIFY BETEILIGUNGSVERWALTUNG GMBH & CO KG | Key module for telephone |
| D938947, | Feb 07 2019 | GN AUDIO A S | Communications equipment |
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Aug 29 2000 | RATH, KLAUS | GN METCOM, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011053 | /0055 | |
| Sep 05 2000 | GN Netcom, Inc. | (assignment on the face of the patent) | / |
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