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The ornamental design for a boom hoist, substantially as shown and described. |
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FIG. 1 is a top left side perspective view of a "boom hoist" showing our new design;
FIG. 2 is a top right side perspective view thereof, and
FIG. 3 is a bottom plan view thereof.
Callahan, F. Gregory, Sabo, Richard S.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Oct 14 1980 | CALLAHAN F GREGORY | HAZARD CONTROLS INC | ASSIGNMENT OF ASSIGNORS INTEREST | 003840 | /0386 | |
| Oct 14 1980 | SABO RICHARD S | HAZARD CONTROLS INC | ASSIGNMENT OF ASSIGNORS INTEREST | 003840 | /0386 | |
| Nov 05 1980 | Hazard Controls Inc. | (assignment on the face of the patent) | / |
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