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Apparently seen in the video game King of Braves GaoGaiGar: Blockaded Numbers.
Technical name: Counter Gravity Shockwave Generator. Developed at NASA in the United States as an "emergency tool" for the Goldion Hammer. It appears to be a tool resembling a jackhammer, built to counter the Goldion Hammer's gravity shockwaves in the event that the Goldion Hammer was ever used against GGG.
This tool was never used by GaoGaiGar; it was instead absorbed by the combined EI-72 and EI-73 Zonder in order to prevent use of the Goldion Hammer against it. In the GaoGaiGar Vs. Betterman light novel, it is also retroactively explained that Zonuda Robo had absorbed this tool to render the Goldion Hammer ineffective.