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Fisher Space Pen. Writes down to -30F and won't leak no matter what (say, from altitude changes going up a mountain.) https://www.spacepen.com/about-us.aspx (And I have no connection to them othe...
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Fisher Space Pen. Writes down to -30F and won't leak no matter what (say, from altitude changes going up a mountain.) https://www.spacepen.com/about-us.aspx (And I have no connection to them othe...