Medical supply store informed alber (b)(4) that the husband of the customer tried to transport his wife down a 12-step stone staircase with the scalamobil s39.After reaching the fourth step and transition to the fifth, the small wheels on the device did not follow whilst the large wheels moved further.As a result the device lost its grip and the husband tried to pulling back the device to prevent a fall, but this did not succeed and both persons (wife on the device, husband as operator) fell down the remaining stairs and sustained serious injuries (patient broken fibula, operator broken lower arm) resulting in a four-day hospital stay.
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