Expansion chamber

The ornamental design for an expansion chamber, as shown and described.

FIG. 1 is a perspective view of an expansion chamber showing my new design;

FIG. 2 is a plan view of one side thereof, the other side being substantially a mirror image;

FIG. 3 is a side elevational view thereof; and

FIG. 4 is an end elevational view thereof.

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55964,

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