4. Building units and construction elements
  5. Prefabricated unit
  6. Closure

Lew V. Hewitt

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Acoustic obstruction detector and method

Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent

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Revolving door assembly with foldable door wings

Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – Wings fold for through passage
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Revolving door enclosure

Building units and construction elements – Prefabricated unit – Closure
Patent

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Profile ID: LFUS-PAI-P-838788

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