3. Given that the implementation of delivery and performance obligations which have been taken on is aggravated, delayed or made temporarily impossible by circumstances not attributable to Vendor, then the Vendor is entitled to extend the delivery/part delivery or service/part service for the length of time of the hindrance plus an appropriate startup time. Given that implementation of delivery and performance which have been taken on is made permanently impossible by circumstances not attributable to the Vendor, then the Vendor is entitled to withdraw wholly or partially from the contract.

The Vendor is not, in particular, responsible for non-culpably occasioned official intrusions, unpredictable operating trouble, strikes, lockouts, interruptions to work caused by political or economic circumstances, unavoidable scarcity of raw material and operating stock, transportation delays due to traffic hold-ups and unavoidable incidents which arise at the Vendor's, his suppliers or at outside companies on which the Vendor's undertaking absolutely depends. The Vendor undertakes to inform the Purchaser immediately on the impossibility of a delivery or service and to immediately reimburse the "quid pro quo" of the Purchaser faced with no delivery or service.