世界で初めてのミリ波干渉計 The First mm-wave Interferometer for Astronomy

The first mm-wave interferometer for astronomy in the world was proposed and 
designed in 1960's at the Department of Physics, Nagoya University, by 
K. Kawabata and Y. Sofue, later joined by H. Ogawa. 

Based on mm-wave experiments at 70 and 35 GHz with single dish telescopes, 
Construction of 8-element 35 GHz interferometer with maximum baseline of 16 m
for solar observations was accomplished in 1970-1971 resulting in several papers 
on radio bursts and the chronosphere physics of the quiete Sun as below. 
The interferometer was further developed to have 16 elements (32 m), and 
was operated till 1980's.

Technology of the mm-wave interferometry is today used in ALMA, EHT, etc.,
for its advantage for high-resolution imaging of radio-opaque objects
such as the black-hole cirumstance.

1972 Kawabata and Sofue PASJ: 35GHz Interferometer 
1973 Kawabata, Sofue, et al.  Sol.Phys: 35GHz Interferometer
1974 Kawabata et al PASJ: 35GHz Interferometer
1974 Ogawa et al PASJ: 35GHz Interferometer