(under subclass 146) Devices which are provided with an envelope and which have a portion of the envelope wall movable, the means for moving the electrode or shield being connected to the movable envelope wall.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
17.8, for miscellaneous structures for transmitting mechanical motion through a wall by means including an imperforate movable envelope wall portion.
403, Joints and Connections,
230+, for joints between a rod-like body transverse to a plate-like body.
