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The ornamental design for a ruler/mathematical aid, as shown. |
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FIG. 1 is a top plan view of a ruler/mathematical aid showing our new design;
FIG. 2 is a right side elevational view, the left side elevational view being identical;
FIG. 3 is a front elevational view, the rear elevational view being identical; and
FIG. 4 is a bottom plan view thereof.
FIG. 5 shows the bottom plan view with cutout shapes thereon which is identical to the top plan view in FIG. 1 and is flat and unornamented.
Chesson, Maureen T., Banks, Phillipa G.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 09 1987 | Aesthetic Holdings Pty. Ltd. | (assignment on the face of the patent) | / | |||
| Mar 23 1990 | CHESSON, MAUREEN T | AESTHETIC HOLDINGS PTY LTD, A CO OF THE STATE OF WESTERN AUSTRALIA | ASSIGNMENT OF ASSIGNORS INTEREST | 005274 | /0499 | |
| Mar 23 1990 | BANKS, PHILLIPA G | AESTHETIC HOLDINGS PTY LTD, A CO OF THE STATE OF WESTERN AUSTRALIA | ASSIGNMENT OF ASSIGNORS INTEREST | 005274 | /0499 |
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