US PATENT SUBCLASS 976 / DIG 180
.~ Vessels characterized by the material; Selection of materials for pressure vessels [G21C-13/08]

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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 180.~ Vessels characterized by the material; Selection of materials for pressure vessels [G21C-13/08] {2}
DIG 181  DD  .~.~> Metallic vessels [G21C-13/08B] {1}
DIG 183  DD  .~.~> Concrete vessels [G21C-13/08D] {1}