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

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...

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