Original electrical trade vintage catalog for SQUARE D COMPANY. Main office and plants were located in Detroit, MI. Milwaukee, WI. and Los Angeles, CA. Manufacturers of circuit breakers. The Square D Multi-Breaker is the connecting link through which electricity flows from the power line into your home. It controls the distribution of current and protects your home against the hazards of short circuits and dangerous overloads. Ends forever the annoyance and inconvenience of blown fuses. The Multi-Breaker eliminates fuses completely. Disbound from a large 1940 electrical construction materials book, this unique old four page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library. Contains a small amount of residual glue on edge.