4. Fluid reaction surfaces (i.e., impellers)
  5. Protective screen or guard
  6. Water or marine propellers

Ralph Zwakenberg

Inventor

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Box fan

Building units and construction elements – Architectural stock material – Post or beam
Patent

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Box fan with air divider ring

Fluid reaction surfaces (i.e. – impellers) – Protective screen or guard – Water or marine propellers
Patent

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Portable fan

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Air treatment
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Profile ID: LFUS-PAI-P-789036

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