Original 1943 electrical trade vintage ad for HEWLETT-PACKARD COMPANY.  Main office and plant was located in Palo Alto, CA.

Manufacturers of Electrical Test Equipment.

Products include: Model 400A Vacuum Tube Voltmeter.  Voltage indication is proportional to average value of the full wave.  Make accurate high frequency measurements (up to one megacycle), without particular precautions. No adjustments to be made during operation and the impedance is so high the circuit being measured is unaffected by the instrument.

Has numerous product images, descriptions, applications and specifications provide extensive product details.

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.