4. Tent, canopy, umbrella, or cane
  5. Canes, sticks, crutches, and walking aids
  6. Walker type

Tianfu Li

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Inclinometer

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Stair climbing walker

Tent – canopy – umbrella – or cane – Canes – sticks – crutches – and walking aids – Walker type
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Profile ID: LFUS-PAI-P-1819250

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