| http://www.w3.org/ns/prov#value | - A working tool according to claim 1, wherein the working tool is a drilling and/or impact hammer, the second unit has a handle, in the first unit there is provided a pneumatic spring hammer mechanism having a drive piston driven by a motor for driving an impact piston by means of an air spring that is able to be produced between the drive piston and the impact piston, and wherein the drive piston
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