An arrangement for {TAIL ~ the remote actuation} of a controlled device, e.g. a hydraulic valve, in situations with stringent safety requirements, uses {HEAD ~ optical power} 
An arrangement for { TAIL ~ the remote actuation } of a controlled device , e.g. a hydraulic valve , in situations with stringent safety requirements , uses { HEAD ~ optical power }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD