4. Static structures (e.g., buildings)
  5. Stepped; e.g., stair

American Stair Corporation Inc.

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Externally reinforced concrete stairs

Static structures (e.g. – buildings) – Stepped; e.g. – stair
Patent

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Reinforced tread assembly

Static structures (e.g. – buildings) – Specified wear or friction-type traffic-carrying surface – Tread-nosing; e.g. – shaped stair pad
Patent

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Profile ID: LFUS-PAI-P-1923212

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