Portion of a dimmer control switch and cover plate

FIG. 1 is a front, bottom and right side perspective view of the design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The rear is not part of the claimed design. The broken line showing in the drawings is illustrative and forms no part of the claimed design.

The ornamental design for a portion of a dimmer control switch and cover plate, as shown and described.

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	Number	Date	Country
Parent	29193479	Nov 2003	US
Child	29221627		US

	Number	Date	Country
Parent	29221627	Jan 2005	US
Child	29243094		US