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[[File:Fisher Space Pen - bullet.jpg|thumbnail|Fisher space pen, called the "bulletpen"]]
The '''Fisher Space Pen''' is a writing implement designed specifically for use in zero-gravity environments with variable atmospheric pressure. It is a gas-charged ball-point pen with replaceable ink cartridges.<ref name="NASA Spacepen">https://history.nasa.gov/spacepen.html</ref>
The '''Fisher Space Pen''' is a writing implement designed specifically for use in zero-gravity environments with variable atmospheric pressure. It is a gas-charged ball-point pen with replaceable ink cartridges.<ref name="NASA Spacepen">https://history.nasa.gov/spacepen.html</ref>