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HELIX (PROPELLER) WITH WINGS DISPOSED PLAN ETARITY ABOUT ITS AXIS OF ROTATION ON A TRACH OF THE SAME OR OF A DIFFERENT RADIUS ON THE SAME OR ON A DIFFERENT TRANVERSE PLANE
HELIX (PROPELLER) WITH WINGS DISPOSED PLAN ETARITY ABOUT ITS AXIS OF ROTATION ON A TRACH OF THE SAME OR OF A DIFFERENT RADIUS ON THE SAME OR ON A DIFFERENT TRANVERSE PLANE