| http://www.w3.org/ns/prov#value | - a housing adapted to receive a syringe having a discharge nozzle, the housing including means for biasing the syringe from an extended position in which the discharge nozzle extends from the housing to a retracted position in which the discharge nozzle is contained within the housing; an actuator; first and second drive elements, of which the first is acted upon by the actuator and the second acts
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