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PCE
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DIFF Subgroup
H04R 27/02

Amplifying systems for the deaf

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Public address systems > Amplifying systems for the deaf

CPC:

Public address systems (circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; ; amplifiers H03F) > Amplifying systems for the deaf

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