US PATENT SUBCLASS 976 / DIG 356
.~ Shielded passages through walls; Locks; Transferring devices between rooms [G21F-7/00B] *** (between glove-boxes DIG. 362)

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 355  DD  SHIELDED CELLS OR ROOMS [G21F-7/00] {5}
DIG 356.~ Shielded passages through walls; Locks; Transferring devices between rooms [G21F-7/00B] *** (between glove-boxes DIG. 362) {1}
DIG 357  DD  .~.~> Transferring by fluidic means [G21F-7/00B2]