US PATENT SUBCLASS 976 / DIG 128
.~.~.~ Means for obtaining differential movement of control elements [G21C-7/18]


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 113  DD  CONTROL OF NUCLEAR REACTION [G21C-7/00] {9}
DIG 117  DD  .~ By application of neutron-absorbing material (i.e., material with absorption cross section very much in excess of reflection cross section) [G21C-7/06] {3}
DIG 118  DD  .~.~ By displacement of solid control elements (e.g., control rods) [G21C-7/08] {4}
DIG 128.~.~.~ Means for obtaining differential movement of control elements [G21C-7/18]