Al Mann did the research and put it in a book he called "The Purloined Letter." It is one of the rarer of Al's books and was, or at least my copy is, hardbacked. The last one I saw went for over $300.
The Center Tear did not come from Annemann or Ovette or Martin Sunshine. Al's research seems solid.
Sid Lorraine got it in England, July, 1928, from an American student named J. T. Garrus. Garrus claimed he'd learned it from Dr. Leland Wyman of Boston, a magician and psychic investigator who learned of it from mediums. Al believed that a small group of magicians who investigated mediums knew the technique as well, notably Joseph Rinn and Joe Dunninger. In The Jinx 74, Jan 6, 1940, Dunninger claimed to have known of the CT as early as 1915.
In 1928 Sid reported on the English magic scene England in The Sphinx but did not detail what he'd learned from Garrus. He wrote three letters to close friends describing the technique: Tom Bowyer, Josepth Ovette and Ted Annemann.
Ovette advertised "What Is It?" in the September, October, and December issues of The Sphinx of 1931 (according to Al) and that was the extent of the advertising. The copy of the ms. that Al obtained was signed by Ovette and numbered 32A, dated October 20th, 1931, suggesting that by October of that year he'd only sold 32 units. The Center Tear was used in that ms. in the performance of a Living and Dead test.
In August, 1932 "Ne Plus Ultra" mindreading became Series No 2, Release No 2 of Thayer's Trick of the Month Club. It was the Center Tear described by Annemann. Thayer also included it as "Smoke Rays" catalog item 1321 for $1.
Annemann put it in The Jinx No 6, March, 1935 and by that point the cat was out of the bag.
Probably the first person to fully realize the potential of the Center Tear was Mogul - Prince of Mystery out of Baltimore. According to Al's book, in 1935 and 1936 Mogul's act was Q&A with the Center Tear and he did good business as the technique fooled a lot of people.
Al reported that when Mogul played Toronto in early 1937 Tom Bowyer discovered to his shocked amazement that Mogul was using a simple technique that Bowyer had known since 1928.
Many years later Al obtained copies of Sid's original notes that he made in England detailing the Center Tear and reproduced them in "The Purloined Thought."
Al also reported that the first public exposure of the CT was in Town and Country magazine in 1939 by someone he describes as "card trickster Jerry Kahler." Apparently Annemann cursed him in The Jinx No 66.