Abstract: A modified lamp includes first and second filaments contained in an envelope to which power is selectively provided individually or conjunctively to obtain three distinct light levels. A contact member in the lamp base is modified to include a planar surface over a major portion of its radial width. Additionally, a lead wire opening that receives one of the lead wires extending from one of the filaments, is spaced from the planar surface to limit the potential for electrical contact with a tang of an associated socket. In one preferred embodiment, the lead wire opening is disposed in a recess that has a maximum circumferential dimension less than the cross-section of the tang to preclude advancement of the tang into the recess. A flat is provided along the outer periphery of the contact member to provide accurate orientation of the contact member during lamp assembly.

Abstract: Apparatus and method for undercutting the insulation material below the surface of adjacent commutator bars on the armature of a direct current motor. A focused laser beam is directed substantially normal to the commutator surface. The beam can be delivered to the surface of the commutator by several different beam focusing and shaping technologies. The high energy beam is scanned over the surface as the armature is held in a fixture and allowed to rotate about its axis to cause the ablation of a predetermined amount of insulative material from between the commutator bars. A high pressure air nozzle is directed at the surface of the armature to remove particles ablated from the surface of the armature by the process.