| http://www.w3.org/ns/prov#value | - It is contemplated that the pins 492???, 494??? are made of an electrically conducting material, such as gold, silver, copper, steel, brass, or other similar material, and are in electrical communication with a switched power supply (not shown) which resides on the optical measurement system 498 or externally thereto. [0214] The interface surface 496 may be made of rubber or other semi-compliant m
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