Nos. 9586-87, 9602-5, in circuit court of appeals for 3d circuit, Frank Burke, etc., et al. (Zayac) v. American Brake Shoe Co.; Frank Burke, etc., et al. (Gracie) v. A. M. Dyers Company; John Grecula, etc., et al v. National Tube Company; James J. Thomas, etc., et al. v. Carnegie-Illinois Steel Corporation; John W. Grajciar, etc., et al. v. Sharon Steel Corporation; John F. Murray, etc., et al. v. Homestead Valve Manufacturing Company; United States, intervener, appeals from final orders and decrees of district court for western district of Pennsylvania; brief of United States as intervenor.

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