The vacuum switch includes {HEAD ~ a movable connecting pin}, a drive lever, a spring, and {TAIL ~ a stop} 
The vacuum switch includes { HEAD ~ a movable connecting pin } , a drive lever , a spring , and { TAIL ~ a stop }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL