The Mizuhashi-Smith Chart
Two years prior
to Phillip Hagar Smith's proposal in 1939, Mizuhashi
Japan Wireless Telegraph Corporation, published a paper which
illustrated a nomogram obviously equivalent to the normalized impedance
Smith chart as "a chart of circular curves of reflection coefficient
$B&C(B corresponding to Z01 (and Z02)"
in Figure 1 as a tool for
graphically calculating impedance. Therefore, in
been claims that the Smith chart should be called the Mizuhashi chart
Mizuhashi-Smith chart .
 Mizuhashi, T.,
four-terminal impedance transformation circuit and matching circuit,"
The Journal of the Institute of Electrical Communication Engineers of
Japan, pp.1053-1058, December 1937 (in Japanese).
 Okamura, S., " "Smith
chart" may have origin in Japan," The
Journal of the Institute of Electrical Communication Engineers of
Japan, pp.768-769, August 1959 (in Japanese).