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Improvement in cellular-wall building-blocks.

Description: Patent for a building block that has an offset in the middle that allows one side of the block to make the outer wall while the other side makes an inner wall while leaving space between the two walls. Includes illustrations.
Date: August 15, 1876
Creator: Clayton, Nicholas J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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