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DIFF Subgroup
G04B 21/08

Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, )

Introduced: September 1968

Title

Titles differ between systems:

IPC: Sounding bodies; Whistles; Musical apparatus

CPC: Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, )

Full Title

Full titles differ between systems:

IPC:

Indicating the time by acoustic means > Regular striking mechanisms giving the full hour, half hour, or quarter hour > Sounding bodies; Whistles; Musical apparatus

CPC:

Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; ) > Regular striking mechanisms giving the full hour, half hour or quarter hour > Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, )

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