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usp015/00472545
Patent for "a simple and economical device of this character, which shall possess superior advantages with respect to efficiency, and whereby sand and dirt is effectually excluded and the grease or other lubricating material prevented from escaping" (lines 15-21).
Date:
April 12, 1892
Creator:
Miller, William J.; McBean, Robert S. & McBurnett, John W.
System:
The Portal to Texas History