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Air-Supplied Respirators | Combination Respirators | Self-Contained Breathing Apparatus |
| use of a hose to deliver clean, safe air from a stationary source of compressed air | | clean air for long periods of time and are light weight for the user | | the range of user-mobility and may fail due to hose damage | | called airline respirators
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| an auxiliary self-contained air supply that can be used if the primary supply fails | | self-contained portion can be small since it only needs to supply enough air for escape | | be used for entry into confined spaces
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