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lentille à échelon
antenn. Zonenlinse f; Stufenlinse f
lentille à échelons
energ.ind. Fresnel-Linse n; Ringlinse f; Stufenlinse f
lentille à échelons lentille de Fresnel
energ.ind. Fresnel-Linse n; Ringlinse f

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