4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Returned signal used for control

David P. 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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Profile ID: LFUS-PAI-P-1215810

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