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The ornamental design for a protective helmet, as shown and described.
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1. Protective helmet
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The claimed design is a protective helmet for use when riding on bicycles, e-bikes and e-scooters; the helmet consists of 9 pads, individually shaped and fitted onto a head-shaped, flexible and 4 way elastic liner; each pad is flexible and semi-soft; the gaps between each pad have the function of being elastic and flexible, and this together with the semi flexible pads makes the entire helmet flexible and semi-soft to better adapt and fit to any head shape; the helmet is foldable, as shown in the reproduction
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| ER902, |
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