Looks like an old blueprint holder here blueprint holder [link] : r/thisisthatthing

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Adir Mobile Blueprint Holder - Vertical Architectural Plan Storage, Poster Display, Map organizer Rack, Hanging File Organizer Stand Used at Office, Home, Art Galleries : Office Products

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Cathyeen Blueprint Storage Rack Blueprint Holder Metal Blueprint Storage Cart with Wheels 12 Slots Roll File Holder for Home Office School to Storage Blueprint Poster Architectural (Black 12 Slots) : Office Products

PhotoEffect: Create a Blueprint Effect in Photoshop

Adir Mobile Blueprint Holder - Vertical Architectural Plan Storage, Poster Display, Map organizer Rack, Hanging File Organizer Stand Used at Office, Home, Art Galleries : Office Products

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Durable and Strong - The AdirOffice blueprint storage organizer is robust, crafted from solid steel, promising longevity with a load capacity of 240

Adir Mobile Blueprint Holder - Vertical Architectural Plan Storage, Poster Display, Map organizer Rack, Hanging File Organizer Stand Used at Office