| 摘要 |
PROBLEM TO BE SOLVED: To issue an unloading log capable of specifying a cause even when unloading can not be done. SOLUTION: The supply of oil to an oil storage tank is started to monitor the supply quantity of oil and, after the supply of oil is completed, the oil storage tank having received the supply of oil, an oil injection date and the unloading quantity of oil are outputted to an unloading control unit 9 to be recorded by a recording means 44 and the error signal outputted from the operation device 12 of a lorry on and after the point of time when the lorry and the oil storage tank are connected by an oil injection hose is collected to be outputted to the unloading control unit 9 to be recorded by the recording means 44.
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