Constructed as part of the axis magnetic pole holder and lid. In addition, it is also used as a through route to the magnetic field's strength, comprehensive transportation magnet. A project may be made of steel or cast iron plates that bend into a cylindrical shape and welding on joints together. In a large konfai in order to ease the transport can be divided into designing structures, into two parts: upper and lower part, both parts can be assembled together with a bolt and screw.
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