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AND-tube Castione della Presolana Civil Service Department disappearing stadia hairs Euboea gilt and silver bimetallism hot-wire vacuum switch light pattern meteic screw thread ocular dominance pier with approach trestlepier with approach brid real time clock right-handed trihedron sea ball side-dumping loader stabilized non-operating temperature stellated structure waalhaven William Edward Burghardt Du Bois x-ray paper