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Bell System Tech. J.
J. Appl. Phys.
Material of this type was obtained from E. Spenke and W. Keller of the Siemens‐Schuckertwerk AG., Pretzfeld, Germany and from their licensees in this country, Dow‐Corning Corporation of Hemlock, Michigan.
R. L. Johnston, B. C. DeLoach, and B. G. Cohen, Bell System Technical Journal (in press).
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© 1965 American Institute of Physics.
American Institute of Physics