Definitely got my attention there. One thing I'm sure of, is that "Ada" and "Chi" are not typical Japanese names, so I would guess that if this is a cue made in Japan, then the name Ada-Chi is a play off Adachi Ward in Tokyo, which borders about 500 meters from where I live. If the Ada-Chi is actually a name (not nickname) then I would doubt that the cue is from Japan.
There is a guy in Adachi ward that runs a wood shop as his main profession, but for pocket change does repair work on cues. He also used to make cues, and according to him, will and can still make cues, but it's not worth his time. When he was making cues, I don't know what he called them, but his current business is called "Ishigaki Kogyo". I would be interested in hearing what he thinks. Give me another day or two, and I might be able to find some more info.
dave