4. Pipe joints or couplings
  5. Frangible element
  6. Score line or groove

William W. Lindquist

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Adjustable flanged fitting for roof openings

Pipe joints or couplings – End to side or plate – Penetrating
Patent

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Extension boom for tractors having back hoe attachments

Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent

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Flanged fittings for floors or roofs

Pipe joints or couplings – Frangible element – Score line or groove
Patent

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Floor or roof drain fitting

Pipe joints or couplings – Frangible element – Score line or groove
Patent

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Profile ID: LFUS-PAI-P-481551

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