They are artist's conceptions, some not based on any known set and some on real prewar models. Clockwise from front: A greatly embellished HM-185; a fairly undistorted HM-226 but with speaker grill that looks eerily prescient of the Crosley Swing-A-View; nothing I recognize; appears to be an HM-171; another figment of the imagination; an HM-275 that went on a diet. The center projection set was probably something "proposed", but the one pictured is doubtful based on any real set that existed up to that time. See also:
http://www.earlytelevision.org/ge.html