Assertion: fountain pen's ink | /r/CapableOf | reduce the risk of a leak
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text: George S. Parker (1863–1937), founder of The Parker Pen Company, patented numerous refinements, including a simplified "self-filling" mechanism (1911), a leak-proof safety cap (1912), and a cunning feature he called the "lucky curve" (1911)—a bent tube connecting the nib of a fountain pen to the side wall of the reservoir, which ensured that any ink trapped in the top always drained back down again through capillary action, reducing the risk of a leak.