Original 1943 electrical trade vintage ad for STACKPOLE CARBON COMPANY.  Main office and plant was located in St. Marys, PA.

Manufacturers of High-Altitude Brushes.

... another Stackploe Engineering Achievement.

Brush problems increase tremendously with altitude, and it has remained for Stackpole to overcome these by producing the first really outstanding brushes for high altitude performance. These brushes are treated with a special process developed by Westinghouse Electric and Manufacturing Company, and have resulted in greatly increased brush life for high-altitude flying.

Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.