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PCE
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CPC Subgroup
G04B 21/08

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

Full Title

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, )