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PCE
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DIFF Subgroup
G21F 7/02

Observation devices permitting vision but shielding the observer

Introduced: September 1968

Full Title

Shielded cells or rooms > Observation devices permitting vision but shielding the observer

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1990.

Child Classifications

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  • G21F 7/03 Windows, e.g. shielded since 1990 IPC+CPC Available in IPC and CPC