What is the ANTIVETER system for umbrellas?
YraaSystem "antiwind» — this is built-in in knitting needles springs, preventing breakdown spokes at impulse wind and umbrella inversion. However, a strong wind can twist such a system. In this…
System "antiwind» — this is built-in in knitting needles springs, preventing breakdown spokes at impulse wind and umbrella inversion. However, a strong wind can twist such a system. In this…