{HEAD ~ A device} 5 wherein {TAIL ~ said first and second boards} are provided with separate biasing means to bias said first board relative to said second board to disengage pins that may be inserted into said openings when said heat recoverable metal goes from its austenitic state to its martensitic state 
{ HEAD ~ A device } 5 wherein { TAIL ~ said first and second boards } are provided with separate biasing means to bias said first board relative to said second board to disengage pins that may be inserted into said openings when said heat recoverable metal goes from its austenitic state to its martensitic state
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