stop-valve protection cover
71Fixer (comics) — Fixer Fixer, by Patrick Zircher Publication information Publisher Marvel Comics …
72nuclear reactor — Physics. reactor (def. 4). Also called nuclear pile. [1940 45] * * * Device that can initiate and control a self sustaining series of nuclear fission reactions. Neutrons released in one fission reaction may strike other heavy nuclei, causing them …
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