force majeure: on the occurrence of any event of force majeure, the seller has the right either to extends the time of delivery of the goods or the terminate this agreement in whole or in part, if it become unable to fulfill its obligations hereunder by reason of any cause, disaster or force beyond the control of seller. the buyer shall not be excused for ots non-performance fo any part of this agreement on the ground of any cause beyond its control, unless agreed by the seller in writing.