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We have been using sandwich freezing of living yeast and bacteria followed by freeze-substitution for observing close-to-native ultrastructure of cells. Recently, sandwich freezing of glutaraldehyde-fixed cultured cells and human tissues have been found to give excellent preservation of ultrastructure of cells and tissues. These studies, however, have been conducted using a handmade sandwich freezing device and have been limited in a few laboratories. To spread the use of this method to other laboratories, we fabricated and commercialized