Engagement of Third Parties. 4.1 The supplier may engage third parties (e.g. subsuppliers, subcontractors) for the rendering of essential services and of services at the sites of the customer only with prior written consent of the customer. The supplier shall remain liable for the rendering of contractual services by the engaged third parties.
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Samples: www.beschaffung.admin.ch, rechtssammlung.sp.ethz.ch, www.ethrat.ch