Many types of useful devices may then be attached to the platform including {HEAD ~ devices} that require {TAIL ~ external power} or devices that possess their own power and are operated via wireless signals 
require
Many types of useful devices may then be attached to the platform including { HEAD ~ devices } that require { TAIL ~ external power } or devices that possess their own power and are operated via wireless signals
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH