Space Pen (also known as the Zero Gravity Pen), marketed by Fisher Space Pen Company, is a pen that uses pressurized ink cartridge and claimed to write in zero gravity, upside down, underwater, on wet and greasy paper, at every corner, and in extreme temperature ranges
The Fisher Space Pen was created by American businessman and a pen manufacturer Paul C. Fisher and manufactured in Boulder City, Nevada, United States. Paul C. AG7 Fisher patented the first "anti-gravity 'pen in 1965.
Model:
There are two models of the pen: AG7 "Astronaut Pen", a long and thin retractable pen shaped like a regular ballpoint pen, and pen "Bullet" non-retractable, shorter than the standard ballpoints when it closed, but fullsize when the lid is posted on the back to write.
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