DIFF Subgroup
H04R 1/20 Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Arrangements for obtaining desired frequency or directional characteristics
CPC: Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00)
Full Title
Full titles differ between systems:
IPC:
Details of transducers > Arrangements for obtaining desired frequency or directional characteristics
CPC:
Details of transducers, > Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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