Expandable combined heating and heat preservation device and heat preservation meal package
The invention discloses an expandable combined heating and heat preservation device and a heat preservation meal package. The expandable combined heating and heat preservation device is suitable for the meal package and comprises a first heat preservation piece, wherein the first heat preservation p...
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Main Authors | , , |
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Format | Patent |
Language | Chinese English |
Published |
03.07.2020
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Subjects | |
Online Access | Get full text |
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