| http://www.w3.org/ns/prov#value | - The device of claim 9, wherein said at least one pulling thread is a first pulling thread, said spring is a first spring, and said at least one fixing element is designed for jointly fixing and tensioning said first pulling thread and at least one further pulling thread, and wherein a further spring for said at least one further pulling thread is arranged on said base body and, in relation to said
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