In American Steel Foundries v. Robertson, 269 U.S. 372, 46 S.Ct. 160, 162, 70 L.Ed. 317, the court said: "The general doctrine is that equity not only will enjoin the appropriation and use of a trade-mark or trade-name, where it is completely identical with the name of the corporation, but will enjoin such appropriation and use where the resemblance is so close as to be likely to produce confusion as to such identity, to the injury of the corporation to which the name belongs."