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Publication of BE424280ApublicationCriticalpatent/BE424280A/xx
H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
H03J1/02—Indicating arrangements
H03J1/04—Indicating arrangements with optical indicating means
H03J1/042—Means insuring a precise reading of the dial, e.g. special scale, local illumination possibly temporary, luminous point moving with the pointer