| http://www.w3.org/ns/prov#value | - The safety syringe according to claim 2, wherein the rear portion of the sliding casing is provided with two grooves, the two grooves are respectively provided with the elastic extension plate, the connection part on the elastic extension plate is the locking notch provided on the elastic extension plate, the connecting portion is a protruding platform provided on the syringe barrel to correspond
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