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Can you put it on the scales, please? cheap diamox dosage In the U.S. and elsewhere, the number of civil helicopter crashes has stayed basically flat over the past decade at around 400 accidents annually world-wide. Despite extensive industry efforts and high-profile pledges to raise the safety bar, the global fatal-accident rate for all choppers has improved only slightly since 2007; and the rate for those used in oil-and-gas operations also has remained largely unchanged through most of those years.