| http://www.w3.org/ns/prov#value | - Embodiment examples of the invention will now be explained in conjunction with the drawings, wherein: FIG. 1 shows a first embodiment of a syringe the piston of which has tongues with barbs: FIG. 2 shows the syringe of FIG. 1 with the piston in the locked state, FIG. 3 shows a second embodiment of a syringe having a piston seal held in a bracket; FIG. 4 shows the syringe of FIG. 3 with the bracket
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