National Geographic : 1948 Nov
NATCO, 505 N. Sacramento Blvd., Chicago 12, Illinois i beautiful Bayfront Parkre Amazing, national first-prize winner, new Paravox 1/3 size previous models. Weighs less, about 4-1/2 oz. with batteries, complete in single case. Thin as a compact. Easy to use and wear. Clear tone. Great power. Economy, uses low-cost, easy-to-get, zinc-carbon batteries. Thousands, world-wide, use a Paravox. FREE booklet"How to Select your Hearing Aid".Write PARAVOX,Inc. 201 1DE. 4th, Cleveland 15,0. "Mention the Geographic-It identifies you."