| http://www.w3.org/ns/prov#value | - The housing element 26 or a part of it can have a constant thickness and material composition, but the thickness and the material composition can also change e.g. linear or non linear over the length or width or both of the membrane layer when a difference in elasticity or stiffness of a housing element part and/or in pressure sensitivity of the warning device is needed dependent on the position o
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