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A pre‐cryogenic holder (cryo‐holder) facilitating cryo‐specimen observation under a conventional scanning electron microscope (SEM) is described. This cryo‐holder includes a specimen‐holding unit (the stub) and a cryogenic energy‐storing unit (a composite of three cylinders assembled with a screw). After cooling, the cryo‐holder can continue supplying cryogenic energy to extend the observation time...
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