Contains advertising matter.Listing the Engineers of Corporations with Their Official Duties and Connections. ... 94.a Wiring Diagram, Browning-Drake Receiver. 111 ff. F.Amplififn /St. Staae Znd.Staye ff.f Tuned I R.F. Tuned franc. ... If a current of frequency b is superposed on a current of frequency a, the resultant current has a frequency equal to theanbsp;...