symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. It forms various
M5 - similar US anti-tank gun 7.5 cm PaK 97/38 - captured French 75 mm anti-tank gun on German carriage 7.5 cm PaK 41 - 75 mm anti-tank gun based on squeeze
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