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The ornamental design for a ventilating concrete block, as shown and described. |
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FIG. 1 is a perspective view of one side, one end _and bottom of the ventilating concrete block embodying the _invention; and _
FIG. 2 is a perspective view of the top, other _side and other end of the ventilating concrete block shown _in FIG. 1.
| Patent | Priority | Assignee | Title |
| Patent | Priority | Assignee | Title |
| 168221, | |||
| 196970, | |||
| D246386, | Nov 17 1975 | Concrete block |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Apr 11 1980 | Warren F. B., Lindsley | (assignment on the face of the patent) | ||||
| Feb 11 1982 | SIEDSCHLAG, ARNOLD C | LINDSLEY, WARREN F B | ASSIGNMENT OF A PART OF ASSIGNORS INTEREST | 003949 | 0096 |
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