Developer unit using magnetic toner particles
 An apparatus in which developer material comprising carrier granules and magnetic toner particles is transported closely adjacent to a latent image. The developer roller transporting the developer material is electrically biased. The electrical bias has a wave form that removes a substantially uniform distribution of magnetic toner particle sizes from the carrier granules and develops the latent image therewith. 
Xerox Corporation
G
G03G
inventional
Bernard John S. Jan
Grushkin Berkes Bares