An electrical power chord 31 may be provided for powering the compressor 23 directly from {HEAD ~ a separate electrical source} such as {TAIL ~ an electrical outlet} or battery pack or for recharging one or more of batteries 26 and 27 
such as
An electrical power chord 31 may be provided for powering the compressor 23 directly from { HEAD ~ a separate electrical source } such as { TAIL ~ an electrical outlet } or battery pack or for recharging one or more of batteries 26 and 27
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH