Geared continuous hinge - Wikipedia

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Fire rating up to 3 hr. metal and 90 min. wood composite (with studs) Door Reinforcement not required Dril-Kwik screws and sex bolts Standard lockside

Hager 780-157 Series Aluminum Heavy Duty Fire Rated Roton Continuous Geared Hinges, Full Surface, Clear Anodized, 83 Length (Pack of 1) - 48059

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Hinge - Wikipedia

File:ALUMINUM CONTINUOUS GEARED HINGE.jpg - Wikimedia Commons

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What is a Corrected Spur Gear Tooth and Why is it Used?

Geared Continuous Hinges