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John, I am not trying to give you attitude, please don't take it that way. I am just trying to make sense of the information. I explained the way I beleived it was from what I know & what I have seen. The idea of a material that only lets helium pass is not impossible because it is a very small molecule, hence its ability to get inside the watch in the first place. I have seen several HEV valves that have a screw down crown which closely resemble the patent listed. Either way please accept my apology if you beleive I gave you an attitude, it really is not worth arguing over.
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