G10K 11/22
Methods or devices for transmitting, conducting, or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
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Edits on 5 Mar, 2022
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Description (+130 characters)
G10K 11/22
Methods or devices for transmitting, conducting, or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
Infobox
Classification Type
Parent classification
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