collective mark

air pollution meteorological centre amorosa Babia Góra(Babia Hora) bichord bobbin winding Dugumenu I. dynapens end-lap weld geological development ground telemetering station irradical negatively charged ion right ventricular stenosis sand-blast apparatus t'ai ho chih wu table-flap the Big Bang total synchronism wait-before-transmitting-positive acknowledgement yearly average continuous operation time