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Improvement in Mixing Mineral and Fossil Substances with Bituminized Clay to Form a Plastic Material.
Patent for mixing mineral or fossil substances with bituminated clay, creating a product that "is a dense, durable, and economical composition, suitable for building both small and massive structures, and for other purposes" (lines 54-57).
Date:
November 11, 1873
Creator:
Lea, Pryor
System:
The Portal to Texas History