4. Fences
  5. Highway guard

Douglas B. Chisholm

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Breakaway coupling and assembly

Static structures (e.g. – buildings) – Frangible section or means
Patent

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Breakaway coupling assembly with fracture-initiating washer

Static structures (e.g. – buildings) – Frangible section or means
Patent

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Couplings for sign posts and the like

Joints and connections – Including frangible component
Patent

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Guard rail construction

Fences – Highway guard
Patent

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Sign post couplings

Joints and connections – Including frangible component
Patent

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Profile ID: LFUS-PAI-P-712316

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