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The ornamental design for a blackboard eraser, as shown. |
FIG. 1 is a perspective view;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a left-side elevational view;
FIG. 5 is a right-side elevational view;
FIG. 6 is a plan view; and,
FIG. 7 is a bottom view.
Patent | Priority | Assignee | Title |
6772472, | Apr 09 2002 | Eraser having selectively openable and closable aperatures | |
D480219, | Feb 24 2003 | LIFETIME BRANDS, INC | Brush |
D505157, | May 25 2004 | Blackboard eraser and dust collecter | |
D552682, | Nov 09 2004 | Societe Bic | Eraser for a white board |
Patent | Priority | Assignee | Title |
3618153, | |||
4462134, | Dec 20 1982 | Blackboard eraser | |
4742594, | Sep 05 1986 | Blackboard eraser | |
4941225, | Nov 13 1989 | Automatic chalk-powder collecting device for blackboard eraser | |
131293, | |||
152146, | |||
JP244898, |
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