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PCE
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CPC Subgroup
G10K 11/22

for conducting sound through hollow pipes, e.g. speaking tubes

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 transmitting, conducting or directing sound (G10K11/02, G10K11/36 take precedence) > for conducting sound through hollow pipes, e.g. speaking tubes