prov:value
| - To this end, it comprises an arch 19 and projections 20, 21, 22, 23. [0042] The weight 8 acts to add weight to the head 1 at the spot where it is located, i.e., substantially on the sides and to the rear of the head 1, but not on the front portion. [0043] It is preferably made of a high-density material, e.g., an alloy containing copper, tin, or other metal.
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