An EXchange name sighting

[M (dir. Joseph Losey, 1951). Click for a larger view.] Perhaps the artist took inspiration from the IBEW logo. ST: in Los Angeles, it might signify STanley or STate.

More EXchange names on screen
Act of Violence : The Amazing Dr. Clitterhouse : Armored Car Robbery : Baby Face : Black Widow : Blast of Silence : The Blue Dahlia : Blue Gardenia : Boardwalk Empire : Born Yesterday : The Brasher Doubloon : The Brothers Rico : The Case Against Brooklyn : Chinatown : Craig’s Wife : Danger Zone : The Dark Corner : Dark Passage : Deception : Deux hommes dans Manhattan : Dick Tracy’s Deception : Down Three Dark Streets : Dream House : East Side, West Side : Escape in the Fog : Fallen Angel : Framed : Hollywood Story : Kiss of Death : The Little Giant : Loophole : The Man Who Cheated Himself : Modern Marvels : Murder by Contract : Murder, My Sweet : My Week with Marilyn : Naked City (1) : Naked City (2) : Naked City (3) : Naked City (4) : Naked City (5) : Naked City (6) : Naked City (7) : Naked City (8) : Naked City (9) : Nightfall : Nightmare Alley : Nocturne : Old Acquaintance : Out of the Past : Perry Mason : Pitfall : The Public Enemy : Railroaded! : Red Light : Side Street : The Slender Thread : Slightly Scarlet : Stage Fright : Sweet Smell of Success (1) : Sweet Smell of Success (2) : Tension : Till the End of Time : This Gun for Hire : The Unfaithful : Vice Squad : Whatever Happened to Baby Jane?