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原帖由 jwlchan 於 30-7-2008 19:26 發表 If the canister is only to use to filter CS gas then it could be use for ever....However, if this is going to use for real Chemical defend then it need to change every few hours.....you also need ...
原帖由 derek_lok 於 30-7-2008 23:22 發表 搞笑一問,, 咁可唔可以駁住個氧氣樽當BA用??