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Latch Device For The Doors of Steam-Shovels, Dredges, And The Like.
Patent for an improved latch mechanism that is easier to construct, operate, and easier to replace on "steam shovels, dredge dippers, or the like, and...to the class of tripping latches" (lines 11-13). Instruction and illustrations included.
Date:
April 11, 1916
Creator:
Watson, Joseph L.
System:
The Portal to Texas History