Assertion: ballpoint pen's pen | /r/CapableOf | utilise pressurised nitrogen
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text: After investing over a million dollars of his own money in creating a pen that utilised pressurised nitrogen (35 psi) to force out a specialized unique gel-like ink Fisher formulated, by 1965 he was in possession of a patent and a pen that could work upside down, underwater, at temperatures from -50 to 400 degrees