US PATENT SUBCLASS 976 / DIG 173
.~.~ Tube crossings through a vessel wall [G21C-13/02H]


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 166  DD  PRESSURE VESSELS; CONTAINMENT VESSELS [G21C-13/00] *** (chemical or physical processes B01J-3/00; pressure vessels in general F16J-12/00) {3}
DIG 167  DD  .~ Details (e.g., seals, supporting constructions, ventillating arrangements, tube joints with a vessel wall) [G21C-13/02] {7}
DIG 173.~.~ Tube crossings through a vessel wall [G21C-13/02H]