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"Report No. O.P.B. 32." ; File number 60157. ; "Note: the Publication Board, in approving and disseminating this report, hopes that it will be of direct benefit to U.S. science and industry. Interested parties should realize that some products and processes described may also be the subject of U.S. patents. Accordingly, it is recommended that the usual patent study be made before pursuing practical applications." ; "This report has been declassified and released to the Office of Publication Board by the War and Navy Departments." ; At head of title: Office of the Publication Board, Department of Commerce. ; Reproduced from typewritten copy. ; Cover title. ; Includes bibliographical references. ; Mode of access: Internet.