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			 The ornamental design for a portable lamp, as shown.  | 
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FIG. 1 is a front perspective view of a portable lamp in accordance with my new design with an optional slidable light shield shown in phantom line;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a back elevational view thereof; and
FIG. 6 is an end elevational view thereof.
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| D305694, | Jul 28 1986 | JJI LIGHTING GROUP, INC | Lighting fixture | 
| D574548, | Feb 21 2007 | IDEAL Industries Lighting LLC | Ceiling lighting fixture | 
| D574549, | May 04 2007 | IDEAL Industries Lighting LLC | Lighting fixture with top mount | 
| D946813, | Mar 10 2021 | Lamp | |
| ER1471, | |||
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