(under subclass 520) Subject matter including two refractor structures.
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268, for plural serial lens elements or components, and subclass 331 for plural serial refractors.
318, for a liquid enclosed in a refractor where the liquid/glass interface bends the light.
331, for plural refractors. [figure] [caption]A - Housing; B - Lens with pillow optics; C - Bulb holder; D - Bulb; E - Intermediate element of transparent plastic; F - Axis of `E' passes through bulb filament; G - Elongated Fresnel prism formation perpendicular to `F'; H - Elongated Fresnel prism formations; parallel to `F'; J - Light ray