A copy of the Northrop Company’s Report HB-20 for the Erection and Maintenance Instructions on the XB-35 aircraft, dated 1 June 1947. Credit: Dick Barton
A copy of the Northrop Company’s Report HB-20 for the Erection and Maintenance Instructions on the XB-35 aircraft, dated 1 June 1947. Credit: Dick Barton
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