| http://www.w3.org/ns/prov#value | - It is important that this curve be as smooth as possible to maintain the integrity of the protective device, especially with regard to resistance to axial and transverse forces. [0034] The width and depth of the creases 16 a, 16 b, 16 c and the distance between the creases 16 a, 16 b, 16 c can be varied depending on the desired properties, such as bending resistance, and the desired distance betwe
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