#shell.housing__case__casing  the housing or outer covering of something; "the clock has a walnut case"
  supertype:  housing.protective_cover  a protective cover designed to contain or support a mechanical component
  subtype:  boot.shell  gearbox  jacket.shell
  part of:  grandfather_clock__grandfatherclock__longcase_clock  a pendulum clock enclosed in a tall narrow case

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