Original 1943 electrical trade vintage ad for JAMES G BIDDLE COMPANY.  Main office and plant was located at 1211-13 Arch Street, Philadelphia, PA.for

Manufacturers of Megger Testers.

Forestall Electrical Breakdowns with the Megger Tester.

Now, more than ever, it is vital to hold electrical failures to a minimum. Periodic testing of the insulation of motors, generators, cables, signal-control and other electrical apparatus can save priceless time and protect irreplaceable equipment. 

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.