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 1/10,000 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