The actuator device comprises a bellows device defining a first chamber partly bounded by a movable wall and a fixed wall, and communicating with two further chambers defined by {HEAD ~ associated housings} carried by {TAIL ~ the said fixed wall} 
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The actuator device comprises a bellows device defining a first chamber partly bounded by a movable wall and a fixed wall , and communicating with two further chambers defined by { HEAD ~ associated housings } carried by { TAIL ~ the said fixed wall }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL