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Miniature bilevel alarm for oxygen-deficient atmospheres

Miniature oxygen deficiency alarm

Published Year

• 1960-1969 (2)

Subject

• Mine ventilation (2) *
• Air sampling devices (1)
• Mine safety--Equipment and supplies (1)
• Oxygen (1)

Author

• Bowser, Merle L. (2) *
• Bradburn, Robert A. (2)

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