piece of metal, and on the frontof the upper central portion of the plate is a socket orkeeper, made integral with the plate, and bent forwardinto inverted cone shape. This socket is adapted toreceive the hook or handle of the miners lamp, thelamp being held by its sides and bottom in a guideframe…
Patents · Inches · Munn · Scientific American · Cast Iron · Steam engine · Horse power · Square inch · Circuit court · Front plate · Letters patent · Sewing machine · Overman wheel
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