Exa Planning (--情報產業総覧; 1990 - the name of this directory isn't quite right)pic.twitter.com/jazBO7JOS7
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Whiteboard is also listed in here. Shunkoh Miki (director on Repulse) is listed as the representative, not Takeshi Tozu.
Zap also here. Started in February 1984, which I think would be after the Way Limit games came out. Was Way Limit a different company?
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