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Investigation of the Muffling Problem for Airplane Engines (1920)

NASA Technical Reports Server (NTRS) · leaf 26

An illustration from Investigation of the Muffling Problem for Airplane Engines, 1920, leaf 26
24 ANNUAL REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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