Penker Construction Company. No. 7729, in United States Court of Appeals for District of Columbia, Apr. term, 1940, Penker Construction Company and Aetna Casualty and Surety Company v. Frank A. Cardillo, deputy commissioner, District of Columbia district, United States Employees' Compensation Commission, and Mrs. Hildren Burton Wilder, intervener, appeal from District Court of United States for District of Columbia; brief for appellees.