From Sega Retro
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Ikegami Tsushinki (池上通信機) is a Japanese broadcasting equipment manufacturer. They are best known for assisting Nintendo with arcade game R&D in the late 1970s-early 1980s, producing Radar Scope and (more famously) Donkey Kong. Their logo is also found in the ROMs of both Congo Bongo and Zaxxon, showing they also worked with Sega; any other partnerships are unknown.