pilot chamber

chamber saturation chamber (= CS-chamber)

HBO chamber hyperbaric oxygen chamber

accumulator spool

actuator spool

actuator spool deadband width

adaptor spool

armature spool

articulated spool piece

automatic spool

blind flanged spool piece

blowout preventer and spool

bobbin spool

brake valve spool

bull spool

casing connecting spool

casing head spool

casing spool

casinghead spool

closed spool