US PATENT SUBCLASS 976 / DIG 354
.~.~ Means for controlling exposure (e.g., time, size of aperture) [G21F-5/04]


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 341  DD  TRANSPORTABLE OR PORTABLE SHIELDED CONTAINERS [G21F-5/00] {9}
DIG 353  DD  .~ With provision for restricted exposure of a radiation source within the container [G21F-5/02] {1}
DIG 354.~.~ Means for controlling exposure (e.g., time, size of aperture) [G21F-5/04]