See Atwater Kent Mfg. Co. v. United States, 62 Ct. Cl. 419; Advance Automobile Accessories Corp. v. United States, 66 Ct. Cl. 304; Borg & Beck Co. v. United States, 67 Ct. Cl. 242; Cuno Engineering Corp. v. United States, 43 F.(2d) 259, 70 Ct. Cl. 384, and Universal Battery Co. v. United States, 281 U. S. 580, 50 S. Ct. 422, 74 L. Ed. 1051.