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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
H04H 20/49

for AM stereophonic broadcast systems

Full Title

Arrangements for broadcast or for distribution combined with broadcast > Arrangements characterised by circuits or components specially adapted for broadcast > specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 > specially adapted for stereophonic broadcast systems > for AM stereophonic broadcast systems