#clean_room__cleanroom__white_room__whiteroom  a room that is virtually free of dust or bacteria; used in laboratory work and in assembly or repair of precision equipment
  supertype:  #room  an area within a building enclosed by walls and floor and ceiling; "the rooms were very small but they had a nice view"
  subtype:  #laminar_flow_clean_room  a clean room free of all extraneous particles; used in fabricating microprocessors

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