U.S. federal trademark · Serial No. 71555290 · Reg. No. 0557132
AN AUTOMATIC DRAFT REGULATOR OF THE TYPE COMPRISING A BLADE PIVOTED IN, AND SUBSTANTIALLY FILLING AN OPENING AND PROVIDED WITH A COUNTER-BALANCING WEIGHT WHICH CAN BE ADJUSTED TO AND FROM THE AXIS OF ROTATION OF THE BLADE TO VARY THE AIR PRESSURE REQUIRED TO TILT THE BLADE AND ADMIT AIR THROUGH THE OPENING
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