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The ornamental design for a double helix bookcase, as shown and described. |
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FIG. 1 is a perspective view of a double helix bookcase showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a side elevation thereof;
FIG. 4 is a top plan view thereof; and
FIG. 5 is a bottom plan view thereof.
The design is characterized by the base member as best illustrated in FIGS. 1 and 5.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 22 1987 | MARK, DAVID S | SPACE AGE DESIGN FURNITURE, 194 SAGAMORE STREET, SAN FRANCISCO, CA 94112 | ASSIGNMENT OF ASSIGNORS INTEREST | 004806 | /0763 | |
| Dec 23 1987 | Space Age Design Furniture | (assignment on the face of the patent) | / |
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