Mitsubishi Electric MR-385R Operating Instructions Manual page 6

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9. Vitamin guard (Vegetable compartment)
Natural herbal will oxidize with oxygen and prevent vitamin loss in vegetable food.
Put vitamin guard in vegetable case.
Remark : Don't open vitamin guard, touch water and clean
If vitamin guard touch water then if will decrease efficiency of vitamin prevention.
It is not necessary to change new vitamin guard, except it occured destruction.
(Broke or get wet, these cases can contact with dealer.)
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