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PAUL C. FISHER had been manufacturing ball point pens for several years when he heard John F. Kennedy’s challenge to land a man on the moon by the end of the decade. Fisher began thinking about how ordinary ballpoint pens would have trouble writing in space, but if a pen could be sealed and pressurized, it would keep the solvents from evaporating in the gravity-free vacuum of space and would also provide a reliable ink supply to the pen point. In 1966, after several years of experimentation, Fisher successfully developed his patented pressurized ink cartridge.