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30:10

30:22 · This is an internationally recognized warning sign, usually red or black on a yellow background, meaning dangerous radioactivity.
    It is also common in computer flow charting meaning external memory or offline memory storage. In this case it originates from a pictorial sign for the magnetic tape cassettes used for storing data in large computer systems. For related structures with similar meanings, turn to 30:30 and 30:58, both in this group.

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