Abstract: An image forming apparatus, comprises: an electrostatic image-bearing member for holding an electrostatic latent image; a developing means for developing the electrostatic latent image to form a toner image on the electrostatic image-bearing member, the developing means including a non-magnetic color toner developing means for development with a developer comprising a non-magnetic color toner and a magnetic toner developing means for development with a magnetic toner, wherein the non-magnetic toner has a volume-average particle size of 4 to 15 microns, the magnetic toner contains 17 to 60% by number of magnetic toner particles having a particle size of 5 microns or smaller, 1-23% by number of magnetic toner particles having a particle size of 8.0-12.7 microns and 2.

Abstract: A key for an electronic lock is provided with a relief coding for reading by a mechanically actuated reading device. The key has a blade along a narrow edge face of which there are formed grooves (or pairs of notches) extending either perpendicularly to the length of the blade or inclined to the perpendicular in one sense or the other.A lock is described in which the grooves or notches are read by two separate reading elements and an electronic circuit determines the key coding by detecting whether the reading elements detect the grooves or notches at the same time or in one order or the other.