BE381999A - - Google Patents

Info

Publication number

BE381999A

BE381999A BE381999DA BE381999A BE 381999 A BE381999 A BE 381999A BE 381999D A BE381999D A BE 381999DA BE 381999 A BE381999 A BE 381999A

Authority

BE

Belgium

Prior art keywords

diaphragm

acoustic

passage

chamber

sound

Prior art date

Links

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