A connecting element for connecting and/or fixing an electrode with an electrode arm of a welding apparatus has a base body; and a sensor selected from the group consisting of a sensor for introducing ultrasound waves into an electrode, a sensor for receiving ultrasound waves and both.

 
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> AC-driven gas discharge display device having plural thin discharge tubes, plural pairs of display electrodes transverse to the thin display tubes and plural signal electrodes transverse to the display electrodes with light-blocking, electrically conductive films between respective pairs of display electrodes
~ 00370