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			 The ornamental design for a rotary copper pipe cleaner, as shown and described.  | 
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FIG. 1 is a perspective view of a rotary copper pipe cleaner embodying the design of the present invention;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is an end elevational view thereof;
FIG. 5 is the opposite end elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The bristles are partially shown for ease of illustration.
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