| http://www.w3.org/ns/prov#value | - The iron path comprises of the collars 30, 30'; 31, 31' and cover 32, 32', together with the fixed core 21, 21', the valve armature 25, 25' except parts 25A, 25A' referred to above, and the piston armatures 20, 20' are all of a material such as Mu-metal, although other materials for example Mu-metal plus, Super Mu-metal, Ortho metal, Super Radio metal or Permendor can be used.
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