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AIR-TYPE SOLAR COLLECTOR PRODUCING HOT AIR FOR SPACE HEATING, DRYING OR WHATEVER TECHNOLOGIC PURPOSE IN GRAVITATIONAL OR VENTILATOR OPERATION AND APPLICABLE ALL THE ROUND HAVING ABSORBER SURFACE OF SELECTIVE EFFECT FORMED BY FLEXIBLE TUBE ENLARGED ITS ENTER SURFACE WITH SPIRAL RIB ON THE SIDE OF SOLAR RADIATION
AIR-TYPE SOLAR COLLECTOR PRODUCING HOT AIR FOR SPACE HEATING, DRYING OR WHATEVER TECHNOLOGIC PURPOSE IN GRAVITATIONAL OR VENTILATOR OPERATION AND APPLICABLE ALL THE ROUND HAVING ABSORBER SURFACE OF SELECTIVE EFFECT FORMED BY FLEXIBLE TUBE ENLARGED ITS ENTER SURFACE WITH SPIRAL RIB ON THE SIDE OF SOLAR RADIATION