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PCE
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DIFF Subgroup
G04B 21/04

Hour wheels; Racks or rakes; Snails or similar control mechanisms

Introduced: September 1968

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 > Hour wheels; Racks or rakes; Snails or similar control mechanisms

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 > Hour wheels; Racks or rakes; Snails or similar control mechanisms

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