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on technical questions arising out of the investigation, and additional witness statements have been secured. Most of the witnesses from whom such statements have been obtained had testified at the public hearing, but a consideration of their testimony indicated the necessity for securing more detailed and specific information from them. In addition, other witnesses who had not been discovered by the Board's investigators during the limited time between the accident and the public hearing were able to give statements pertinent to the issues involved in the investigation. The testimony contained in these technical reports and supplemental witness statements will be discussed later in this report.
Upon the basis of all the evidence available to it at this time, the Board herewith makes its report in accordance with the provisions of the Civil Aeronautics Act of 1938, as amended.
II
SUMMARY OF EVIDENCE
There follows a summary of the evidence available to the Board at this time. This summary is made without comment. An analysis of the evidence is made under Part III of this report.
Air Carrier
Pennsylvania-Central Airlines, a Delaware corporation, was operating at the time of the accident as an air carrier under a certificate of public convenience and necessity and an air carrier operating certificate issued pursuant to the Civil Aeronautics Act of 1938. These certificates authorized it to engage in air transportation with respect to persons, property, and mail between various points, including Washington, D. C., and Detroit, Michigan, via Pittsburgh, Pennsylvania, Akron, Ohio, and Cleveland, Ohio.
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