| http://www.w3.org/ns/prov#value | - The invention is further illustrated with reference to the drawings of which FIG. 1 is a cross section taken along the length of a preferred embodiment of chamberdrill assembly of the invention; FIG. 2 is an enlarged and more detailed cross section along the length of a chamber section of FIG. 1; FIG. 3 is a sectional view of a block element of a breech, or closure, block of the chamber of FIGS. 1
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