| CPC H01J 37/147 (2013.01) [H01J 37/3171 (2013.01); H01J 2237/032 (2013.01); H01J 2237/038 (2013.01)] | 17 Claims |

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1. An insulator, comprising:
a shaft having a first end and a second end; and
a shaft lattice disposed on an outer surface of the shaft.
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