Last December, I posted a photo of a mystery portable restroom I came across at a Dubuque, Iowa, construction site while on vacation. I called its owner, PRO Clark Wolff of Selco Inc., who said the tough-as-nails green unit went back about 30 years, and that he still placed a...
He Called it the Strongbox
Vintage green restroom was an update of the bulletproof USANCO unit that replaced many first-generation wooden models on construction sites
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