A group of Mueller Electric Co. No. 27 electrical test clips manufactured in Cleveland, Ohio. The clips are constructed of steel and are housed in their original cardboard packaging. The front of the box displays a blue graphic illustration of a test clip situated above the model designation No. 27. Each metal clip features stamped text identifying the manufacturer as MUELLER ELEC CO CLEVELAND and includes the technical specifications PAT. CLIP and CAP 20 AMP. The clips are designed for 20-ampere capacity and represent mid-20th-century industrial electrical components.