US PATENT SUBCLASS 976 / DIG 108
.~ Characterized by shape [G21C-5/14]

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 99  DD  MODERATOR OR CORE STRUCTURE; SELECTION OF MATERIALS FOR USE AS MODERATOR [G21C-5/00] {4}
DIG 108.~ Characterized by shape [G21C-5/14] {1}
DIG 109  DD  .~.~> Shape of its constituent parts [G21C-5/16]