Earpieces; Attachments therefor

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of transducers > Earpieces; Attachments therefor

CPC:

Details of transducers, > Earpieces; Attachments therefor

CPC subdivides this area 9x more granularly than IPC with 8 additional codes.

8 codes are CPC-only extensions.

IPC defines codes here since 2026.

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H04R 1/1008 CPC only CPC only
H04R 1/1016 CPC only CPC only
H04R 1/1025 Accumulators specially adapted for earpieces; Arrangements specially adapted for charging thereof since 2026 IPC+CPC Available in IPC and CPC
H04R 1/1033 CPC only CPC only
H04R 1/1041 CPC only CPC only
H04R 1/105 CPC only CPC only
H04R 1/1058 +2 CPC CPC only CPC only
H04R 1/1083 CPC only CPC only
H04R 1/1091 CPC only CPC only