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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G10K 11/1752

Full Title

Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general > Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) > using interference effects; Masking sound

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.