#pipe_wrench__tube_wrench  adjustable wrench for gripping and turning a pipe; has two serrated jaws that are adjusted to grip the pipe
  supertype:  #adjustable_wrench__adjustable_spanner  can be changed to different settings
  subtype:  #chain_tongs__chaintong__chain_wrench__chainwrench  a pipe wrench used for turning large pipes; an adjustable chain circles the pipe with its ends connected to the head whose teeth engage the pipe
  subtype:  #Stillson_wrench  a large pipe wrench with L-shaped adjustable jaws that tighten as pressure on the handle is increased

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