{HEAD ~ Thumb screw} 8 spans {TAIL ~ slot} 8a formed by arms 8b and 8c, and is used to clamp one end of a metal electrical conduit pipe 35 when bending the pipe 
spans
{ HEAD ~ Thumb screw } 8 spans { TAIL ~ slot } 8a formed by arms 8b and 8c , and is used to clamp one end of a metal electrical conduit pipe 35 when bending the pipe
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