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			 The ornamental design for combined tanks and supporting structure for waterblast apparatus, as shown and described.  | 
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FIG. 1 is a perspective view of the combined tanks and supporting structure for waterblast apparatus showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is an end elevational view taken from the right of FIG. 1;
FIG. 4 is an end elevational view taken from the left of FIG. 1;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof, the bottom being unornamented.
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| D273875, | Apr 13 1981 | Dispenser for a roll of aluminum foil | |
| D521070, | Jul 14 2003 | Roger Hill Building Design | Tape cutter | 
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