Abstract: The invention relates to a bone marrow aspiration trocar comprising an element in the form of a hollow needle, the end of said element being provided with a prehension body (20) having a handle with lugs (4), and an insertion end (22). According to the invention, said insertion end (22) is closed and has lateral aspiration holes (21), whereas the other, prehension end (20) comprises a housing (L) provided with a bottom surface (28) which is penetrated by a perforating rod (24), and used as a support, either for a removable lid (26) or a capsule which is under a vacuum (27) and has a sealed diaphragm (27a), for handling said trocar.

Abstract: A retractable boundary mark, particularly a road boundary mark, comprising a movable boundary mark body (5) which can move inside a corresponding housing or casing (4), whose upper side is open, from a working position wherein said body (5) fixedly extends above the level of the open end of the housing (4) to a resting position wherein said body (5) extends so that its top is approximately level with the housing (4) open end, characterized in that the body of said movable boundary mark (5) forms an integrated electric distribution point which is supplied by a source of electric power (20) so that at least one current consumer (21, 22) can work, said consumer being placed on the body of the movable boundary mark (5) or connected to the latter thanks to a cable (23).

Abstract: A device for locking a sliding body, such as a retractable road boundary-mark, in at least two predetermined positions towards which the device is urged by a controller. The device includes a locking rod extending parallel to a sliding axis of the sliding body and rotatable about a longitudinal axis thereof. The locking rod has a plurality of transverse notches whose number and mutual distance along the rod are equal to the number and the mutual distance of the predetermined positions and which are angularly spaced from each other about the longitudinal axis of the rod.