| http://www.w3.org/ns/prov#value | - In many instances, however, there is an requirement to form a multiplicity of holes and time may be saved by drilling all or at leastseveral holes simultaneously using a multi-electrode head similar to that schematically represented in the drawings.The electrode supporting head 11 is carried by a transducer output member 13 and is positioned vertically above a workpiece, generally indicated at 14,
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