4. Ventilation
  5. Having protecting air current
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Device for dynamic separation of two zones

Ventilation – Having protecting air current – Including plural – layered currents
Reexamination Certificate

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Device for producing hot air curtains for door openings in...

Ventilation – Having protecting air current
Reexamination Certificate

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Device for separating two zones with different environment

Ventilation – Having protecting air current
Patent

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