| http://www.w3.org/ns/prov#value | - Drum 70 may be fabricated, for example, by making a core of a suitable material, such as Aluminum, placing the core and rings 74 in a mould with the core passing through but not touching rings 74, soldering electrical conductors 78 to rings 74, and filling the mould with an electrically insulating epoxy material 77 such as the Sealtronic??? epoxy encapsulate available from Industrial Formulators o
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