111 A.2d 118 Helmig, Appellant, v. Rockwell Manufacturing Company. Supreme Court of Pennsylvania.Argued October 8, 1954. January 3, 1955. Brokers — Compensation — Proof of sale or procurement of purchaser — Commencement of negotiations — Direct deal between purchaser and principal — Accomplishment of specified result — Revocation of offer by principal — Restatement, Agency. […]