| 摘要 |
The device, for verification that the cold sequence for frozen packaged prods. has not been broken, consists of a sealed compartment contg. a core of one or more ice tablets, opt. coloured, which passes a specified shape and colour if the sequence has not been broken. Also a container with two receptacles with openings at the same level and one larger than the other, the larger one being completely filled with water and the other with colourant closed by a film, which is broken off when the water freezes, to leave both receptacles communicating.
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