Findings from dredging of rivers or unexpected discoveries, several decorated socketed axes or adzes made of antler have formerly been recognized as Mesolithic in northern France (Blanchet / Lambot 1977 and 1078). The technological reinvestigation of them comes to suggest that these have been used as axes or adzes after they have been engraved and then hafted. The study of binding system shows both that once fitted, the decor was not necessarily intended to be visible at the time these were employed. Moreover, geometric patterns evoked by the engravings themselves show that in some cases the utilization of a registry of forms deliver sense. The oral presentation will focus on the discussion of these two aspects of the function of art and cached symbolism carried by this type of Mesolithic decorated heavy duty tools. The results will also be discussed in relation to chrono-cultural context and to Maglemose which these pieces were attributed. BLANCHET J.-C. ; LAMBOT B. (1977) Les dragages de l'Oise (première partie). Cahiers archéologiques de Picardie 1977: 61-87. BLANCHET J.-C. ; LAMBOT B. (1978) Les dragages de l'Oise (deuxième partie). Cahiers archéologiques de Picardie 1978: 89-104.