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May I suggest weighing the +p+ cases and then weighing a non +p case made by the same manufacture and see if it is heavier? If it is then it's extra strong, if not, it was merely to mark the higher pressure of the load in the case.
Deaf
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“To you who call yourselves ‘men of peace,’ I say, you are not safe without men of action by your side” Thucydides
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