have u ever cheak ur LPG gas cylinder expiry date.............

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dont u think we keep on using same cylinder for many years .the vendor come and give us the other filled cylinder and take the empty one .sometimes those cylinder r quite old ,everything have expiry date ,so i think it must have some way to know its expiry date.because it can be dangerous sometime .if someone know about it ,please inform me how to cheak its expiry date...........