I appreciate your kind advise with a nice ham-shack corner photo.
I could find the Heathkit Antenna Tuner, Daiwa Antenna Tuner CNA 1001, and IC-710A.
Because recently I got them from Japanese Yahoo auction, too, and got Collins HF-2050 receiver that had designed as the original 1st version of SDR during early 1980s.
Unfortunately, I am still now preparing to restart my radio hobby again since my moving to Nara from Yokohama.
Some day, I am sure to communicate with you in Germany, through wireless method.
Best regards, Katsuhiko