{HEAD ~ The aircraft fuel system control circuit} may also, in the second embodiment, include pre existing jettison system valve control circuitry 400 or {TAIL ~ design provision} for optional jettison system valve control circuitry 400 through a daughterboard, external signal and power bus, or the like 
{ HEAD ~ The aircraft fuel system control circuit } may also , in the second embodiment , include pre existing jettison system valve control circuitry 400 or { TAIL ~ design provision } for optional jettison system valve control circuitry 400 through a daughterboard , external signal and power bus , or the like
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