Bell System Technical Journal, v28: i4 October 1949

**Table of Contents**
Page(s)	Article Title	Author(s)
601-607	Reactance Tube Modulation of Phase Shift Oscillators	Dennis, F.R.; Felch, E.P.
608-618	A Broad-Band Microwave Noise Source	Mumford, W.W.
619-646	Electronic Admittances of Parallel-Plane Electron Tubes at 4000 Megacycles	Robertson, Sloan D.
647-655	Passive Four-Pole Admittances of Microwave Triodes	Robertson, Sloan D.
656-715	Communication Theory of Secrecy Systems	Shannon, C.E.
716-750	The Design of Reactive Equalizers	Brogle, A.P., Jr.
751-752	Abstracts of Technical Articles by Bell System Authors
753	Contributors to this Issue

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