Addenda to "Bibliography on Directional Couplers"

Additions to "Bibliography on Directional Couplers" (ibid., vol. MTT-2, No. 2, pp. 58-63, July, 1954) covering the years 1941-1954.

[1]  A. Alford,et al.  Coupled Networks in Radio-Frequency Circuits , 1941, Proceedings of the IRE.