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GB191418138A
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Improvements in Drivers' Helmets.
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GB191406328A
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Improvements in the Regeneration of Impure Air particularly for use in connection with Respiratory Apparatus.
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GB191405746A
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Improvements in Respiratory Apparatus.
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US1150508A
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Mask, helmet, or the like for use with respiratory apparatus.
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US1131490A
|
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Diving apparatus.
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GB191306358A
|
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Improvements in Respiratory Apparatus.
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GB191304378A
|
|
Improvements in and relating to Respiratory Apparatus.
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GB191229162A
|
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Improvements in and relating to Respiration Apparatus.
|
|
US970024A
|
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Device for preventing the ignition of pressure-reducing valves.
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GB190718031A
|
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Improvements relating to Hydraulic Seal Safety Apparatus for use with Oxy-acetylene Blow Pipes and for other purposes.
|
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GB190120558A
|
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Improvements in Apparatus for Respiring in Foul Air.
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