| http://www.w3.org/ns/prov#value | - The core element 12 is shown in detail in FIG. 3 and is formed of a suitable material such as stainless steel and has a suitable diameter such as from 0.015 to 0.025 and preferably a diameter of 0.02, plus or minus 0.0003 and having a suitable length such as 7 feet.
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