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Publication of BE411921ApublicationCriticalpatent/BE411921A/xx
H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses