Color image. Advertisement for Barrett portable Model 10X Adding and Computing Machine. A woman is seated at a typewriter with the adding machine to her right. Her right hand is on the machine. " She'll do the billing accurately - quickly- neatly - with the Barrett portable Model 10X Adding and Computing Machine. A standard key board computing machine that weights only 23 1/2 pounds, easily carried from desk to desk, job to job. Desk space, only 9 x 12 inches, yet has the capacity of machines costing several hundred dollars. A range of usefulness equal to two or more non-portable types. And a price that seems incrediable - $135 Demonstrated and sold by Form A-19"