Photograph of an echoplex EP2 chassis showing the chrome plating and silkscreening the manufacturer did. The EP2 was an early to mid 1960's tape echo device that used an endless loop of tape and tubes.

They didn't just build them like tanks, oh no. They chrome plated the chassis that no one but techs would ever see. Then they silk screened on their logo *and* then locations & functions of all the tubes. #echoplex #EP2 #iFixexIt