matter of considerable difficulty for the which features are embodied in a single tool. novice and is often a source of annoyance to even the The device, as shown in Fig. 1, comprises a body TOOL FOR WITHDRAWING CASINGS FROM WELLS experienced draftsman. A very useful invention, portion having near… … teeth into the inner surface of the casing section, as A SIMPLE SAW-TOOTH TOOL. IMPROVED DRAWING COMPASSES. shown in Fig. 2. Thus a firm grip is secured and the section may be drawn up upon the application of suffi- cient power. To loosen the casing in the bore wbe a projection is another slot used…
Patents · Tinning · Tin · Feet · Turbine · Horse power · Scientific American · Engine room · Square feet · Tin plate · Power house · Steam turbine · Gas engine · Torpedo boat · Wedge block
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