prepared by the Technical Service Dept. of General Electric X-Ray Corporation (now, General Electric Company, X-Ray Department) ; under the editorial supervision of Glenn W. Files ; contributors, John R. Armstrong ... [and others]
prepared by the Technical servicedepartment of General Electric X-ray Corporation, under the editorial supervi-sion of Glenn W. Files, director, in association with these contributors: John R. Armstrong, George A. Ashworth, Charles H. Buckingham [and others]..