| http://www.w3.org/ns/prov#value | - vention will now be described in detail below with reference to the accompanying drawings, in which: FIG. 1 is an elevation, partially in section, of a tool-holding device with a boring head inserted, FIG. 2 is an elevation, partially in section, of a tool-holding device with an extension, FIG. 3 is a longitudinal section through part of the tool-holding device and the tool support in a second emb
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