Engine : Engineering Safety - 450/968
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| Which of the following limitations is correct regarding gas or filter masks? |
| A) A maximum of only 30 minutes of protection is afforded with a single canister when in atmospheres containing highly toxic gases. |
| B) All canisters must be discarded within 24 hours when the seal becomes broken. |
| C) A canister is reliable for up to 5 years from the date of manufacture, as long as the seal is unbroken. |
| D) All of the above. |
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