Oil burners to machine gun parts. Using a micrometer to check this small part for an army machine gun, this worker must achieve tolerance not greater than 110,000 of an inch. This upper New York state factory, which formerly produced oil burners, is under contract for 75,000 small precision parts for the Army. Its employees are super-skilled workmen, many of whom have been with the firm for decades. Reif-Rexoil Company, Buffalo, New York