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corporate-venture Daubikhe glass-plate (liquid) level ga(u)ge Grimnitzsee Gu Yanwu indifference-level index number inter-train pulse involucrated moving plates of variable condenser narrow-beam geometry NCTS pork loin resemblant reservoir drain cock separate valve box type piston pump slab thickness solvent fractionating stern fork superior pyramidal decussation wate-coold tube