A dough mixer includes a cabinet and a bowl supported within the cabinet. A surgical accessory may be attached and removed from a manipulator arm during a surgical procedure without requiring the use of an intermediate sterile accessory clamp, thus removing the need for a detachable accessory mount or adaptor that needs cleaning and sterilization and allowing for greater efficiency and cost-effectiveness. A plurality of such lines are aligned in a second direction, which is orthogonal to the first direction, to form a display screen. When a downloaded file contains a virus, the downloaded file is deleted, and an error message is sent to the web client to inform the web client that the requested file had a virus. The mixed fluid passes through a metal trap composed of a container containing plural silicon chips as a metal adsorbent, thereby to remove the remaining metals therefrom.