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acetone formaldehyde resin air space porosity Bambusa pervariabilis cauterization of sclera CB-1932 chucho hydrophobic chain iminobiotin internal magnetic recording Kilogram-caloric magnetic hard material milling and boring heads non-spontaneous process nonparoxysmal tachycardia Robert's Rules of OrderH.M. space-hold spherical vault Tungum wappentake zer