How can I build a retractable medical oxygen hose reel?

Strong, Durable and Reusable retractable medical oxygen hose

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Coiled Oxygen Tubing Retractable - Tidy Tubing - oxygenplusmedical

Cyclone Pneumatic CP3100 Retracable Air Hose Reel

How can I build a retractable medical oxygen hose reel?

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Hose, Cord & Cable Reels

LOCKED AT ANY LENGTH & SAFETY LOCK: When you pull the hose to a certain length, it will lock automatically, so you don't have to hold it all the time,

1/2 Inch 100 FT Retractable Garden Hose Reel, Slow & Safe Return System, Water Hose Reel with Brass Connector, Double Lock Design, 8 Patterns Nozzle

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