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of a deposit rich in hammering (in Polivanov, Russia), but, like the rest of the sites, they are almost all from the Neolithic period onwards. The size of hard hammers depends on their function: there are very large ones for roughing, medium ones are used for the main work, small ones are auxiliary tools to prepare percussion platforms, or retouch flakes. As for the shape, there are circular, oval, rectangular, etc... In fact, the shape depends

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