fourth order Fresnel lens (Q24629281)
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Current Data About fourth order Fresnel lens
(P18) Image Provided By https://upload.wikimedia.org/wikipedia/commons/1/1b/Elizabeth_Donkin_Lighthouse_Lens.jpg

(P155) (Q24629169)

(P156) (Q24628998)

(P279) (Q14672)

(P373) Fourth order fresnel lenses

(P2151) 250

(P3451) 4th Order fixed Fresnel Lens, crica Late 1800's (41645846745).jpg

(P7084) (Q24630839)
(P4224)

other details
aliases 4th order Fresnel lens