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Mold for Making Sewers.
Patent for a new and improved sewer mold. This design consists in "[a]n expansible and contractible reversible mold for sewers, in form in cross-section of either a semi-circle, semi-ellipse, or semi-ovate, formed of segmental portions hinged together and provided with stay-braces and thrusting tie-rods" (lines 76-81).
Date:
June 18, 1889
Creator:
Baade, John
System:
The Portal to Texas History