Design Feature:
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(1) Vortices, rotary movements, tornadoes
(2) Propellers, ventilators, blowers, turbines, burners ; all kind of propellers, including those for aircraft or ships
(3) Two lines or bands
(4) Thick lines, bands
(5) Horizontal lines or bands
(6) Curved lines or bands (except A 26.11.13)
(7) Green
(8) Blue
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