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The testing of the internal combustion engine driven emergency generators at least onceeach month the navigated The testing of storage batteries for emergency lighting and power systems once each 6months the vessel is navigated The actual draft when the vessel arrives in salt water after departing a port The testing of the line-throwing appliance once every 3 months"
clean cleaned to clean cleaning
being killed to be killed killing to have been killed
at once at first at last at least
week month three months six months
instead altogether at once at least
at last at once at the end at least
Once every third year Once a month Once a year Once a week"
sooner or later once in a while in the end more or less
each four year each fourth year every four years every fourth years
at first at last at least at once
at a time once at once once in a while
at once at all at times at least
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