In the Matter of the Petition of GREAT EASTERN GRAVEL CORPORATION, as Owner of THE Steam Tug GEORGE A. KEATING, for Limitation of Liability. Northwestern Fire & Marine Insurance Company, Moran Brothers Contracting Co., Inc., Appellants. NORTHWESTERN FIRE & MARINE INSURANCE COMPANY, Libelant-Appellant, v. THE Steam Tug GEORGE A. KEATING, Her Engines, etc., Great Eastern Gravel Corporation, Claimant-Appellee; MORAN BROTHERS CONTRACTING COMPANY, Inc., Libelant-Appellant, v. SEABOARD SAND & GRAVEL CORPORATION, Great Eastern Gravel Corporation, Respondents-Appellees