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  • which is also the axis of helicoids of the helicoidal illuminators, the foci of the sectors of the paraboloids being spaced on said same axis by K ??, and each sector having a symmetry of revolution about said same axis, wherein K is an integer and ?? is the wavelength of radiation to be received; and wherein one of the helicoids having the same axis is excited from a rear direction in a back-fire
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