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PCE
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DIFF Subgroup
H04K 1/04

by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Introduced: September 1968

Full Title

Secret communication > by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

No child classifications to compare. This is a leaf node in both IPC and CPC.