#housing.protective_cover  a protective cover designed to contain or support a mechanical component
  supertype:  #protective_cover__protective_covering__protection  a covering that is intend to protect from damage or injury; "they had no protection from the fallout"; "wax provided protection for the floors"
  subtype:  #binnacle  a nonmagnetic housing for a ship's compass (usually in front of the helm)
  subtype:  #cabinet.housing  housing for electronic instruments, as radio or television
  subtype:  #crankcase  housing for a crankshaft
  subtype:  #distributor_housing  the housing that supports the distributor cam
  subtype:  #journal_box__journalbox  metal housing for a journal bearing
  subtype:  #lamphouse__lamp_housing  housing that holds a lamp (as in a movie projector)
  subtype:  #radome__radar_dome__radardome  a housing for a radar antenna; transparent to radio waves
  subtype:  #shell.housing__case__casing  the housing or outer covering of something; "the clock has a walnut case"
     subtype:  #boot.shell  protective casing for something that resembles a leg
     subtype:  #gearbox__gear_case  the shell (metal casing) in which a train of gears is sealed
     subtype:  #jacket.shell  the tough metal shell casing for certain kinds of ammunition

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