Radio Hook-ups, a Reference and Record Book of Circuits Used for Connecting Wireless Instruments ...M. Sleeper1922
Super-heterodyne Hook-ups, by M.B. Sleeper; Complete Circuits and Constants for Eight Approved Types of Super-heterodyne Receiving Sets, Not Experimental Diagrams but Practical, Tested Outfits Which Bear Out the Reputation of the Super as the Rolls-Royce of Radio ...M. Sleeper1924