First published by Edward Marlo in Marlo's Magazine, Vol. 1, 1976, p. 25.

The origin of this sleight has been tinged with controversy. The respected Scottish card magician Gordon Bruce reports showing the Unit Upjog Addition to Edward Marlo in 1975, while Bruce was in Chicago. Before Chicago, Bruce spent several days in Los Angeles, where he showed the sleight to Ricky Jay, Larry Jennings, Bill Goodwin and others. Marlo published the sleight in 1976 without mentioning Bruce. When Bruce returned to Chicago in 1980, by Bruce's account, they discussed the matter and Marlo eventually conceded that the sleight was Bruce's but that Bruce “was doing it wrong”. Bruce has never aired these recollections in print, viewing the situation as an oversight and being reluctant to tarnish the reputation of his friend. Bruce's demonstrations of the sleight in Los Angeles in 1975 have been collaborated by trustworthy sources, and Bruce is credited with the sleight in Mr. Jennings Takes It Easy by Richard Kaufman, 2020, p. 82.

A clear precursor to this sleight is found in “The Burglars: A Story Trick” in Jean Hugard's Card Manipulations, No. 1, 1933, p. 10. This uncredited sleight injogs the desired cards, rather than outjogging them, and it lacks other refinements described by Marlo; however, the central concept of the two sleights is the same.

Using a similar, simpler dynamic to the Unit Upjog Addition (although more limited in its application), a packet may be secretly loaded under the last of a small number of cards that are outjogged as they are arrived at while spreading through the deck. This sleight was first published in The Tarbell Course in Magic, Vol. 5 (1948, p. 122), where it is described within the context of “Paul Rosini's Ace Transposition”. In Frank Csuri's 1961 unpublished manuscript The Magic of Charles Earle Miller, which gathers correspondence between Miller and Faucett W. Ross from 1930-1960, this addition idea is said to be Miller's; see p. 47, “26. The Four Aces and Four Jacks”. Csuri dates only some of the letters, and this one is not in that group. However, it falls directly after a letter that is dated 11/24/31, and the next date given (on p. 52) is 1/20/43. So the likely period of the letter in question is the early 1930s to the early 1940s. Miller's claim to the sleight is furthered by his opening comment about it: “Paul Rosini called this 'wonderful' […]” This simple upjog addition is also credited to Miller in Jacob Daley's Notebooks, published in 1972, p. 192. The entry, “718. Charlie Miller's Modified Vernon Strip-out”, was made by Daley in his fourth notebook, with entries spanning Sep. 1940-1944.