A vacuum switch with {TAIL ~ a driving device} for switching {HEAD ~ a vacuum tight switching tube} into on and off positions 
A vacuum switch with { TAIL ~ a driving device } for switching { HEAD ~ a vacuum tight switching tube } into on and off positions
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH