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The ornamental design for a pre-cast concrete unit for manholes, as shown and described. |
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FIG. 1 is a top perspective view of the design;
FIG. 2 is a bottom perspective view thereof.
Brown, Brian E., Hall, Alfred G.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Aug 09 1976 | Moduloc Concrete Products (London) Ltd. | (assignment on the face of the patent) | / |
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