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PCE
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DIFF Main Group
G03B 31/00

Associated working of cameras or projectors with sound-recording or sound-reproducing means

Introduced: September 1968

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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  • G03B 31/02 in which sound track is on a moving-picture film IPC+CPC Available in IPC and CPC
  • G03B 31/04 in which sound track is not on, but is synchronised with, a moving-picture film IPC+CPC Available in IPC and CPC
  • G03B 31/06 in which sound track is associated with successively-shown still pictures IPC+CPC Available in IPC and CPC
  • G03B 31/08 with fade-in and fade-out effects since 1985 IPC+CPC Available in IPC and CPC