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autocollimation angle black abalone control rod cluster changing fixture cryogenic supercon ducting gyroscope double lark's head exhaust heat recovery unit ija Lophostemon marshallian consumer surplus McLeod County piezocrystal sensor pillar of Corti's organ point-eight press wax queuing principle refutability ribonucleoproteins roll around Trans-Nerolidol water-to-carbide acetylene generator