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John S. Parkinson received US Patent No. 2,029,441 on February 4, 1936, filed December 12, 1933. It was assigned to Johns Manville.
The patent's description opens (from the scanned text):
This invention relates to an acoustical stmoture and particularly to one that is adapted for use in the absorption of sound of low frequency, such, for example as that emitted by an airplane motor.
- Author
- John S. Parkinson
- Published by
- US Patent Office
- Series
- US Patent No. 2,029,441
- Date
- February 4, 1936
- Library no.
- ACL Doc 21646 · asbestosclaims.law/library/21646
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 4 pages · 427 KB
Where it was listed
- Asbestos, April 1936, in its patents department (the year's issues)
Cite this document
John S. Parkinson. “Acoustical Structure (US Patent 2,029,441, 1936).” February 4, 1936. US Patent No. 2,029,441. US Patent Office. AsbestosClaims.Law Library, ACL Doc 21646. https://asbestosclaims.law/library/21646.
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