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Optical equipment with prism assembly for projecting a composite image from two separate transparencies

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1. A COMPOSITE OPTICAL IMAGE PROJECTION EQUIPMENT COMPRISING A BASE HAVING A TOP WALL WITH A PAIR OF SPACED OPENINGS, MEANS IN SAID BASE TO PROJECT LIGHT THROUGH SAID OPENINGS, MEANS TO MOUNT A TRANSPARENCY ON SAID TOP WALL OVER EACH OF THE OPENINGS THEREIN RESPECTIVELY, A PROJECTION HEAD OVER SAID BASE, SAID PROJECTION HEAD COMPRISING A PAIR OF MIRRORS INCLINED TOWARD EACH OTHER, EACH MIRROR BEING IN THE PATH OF THE LIGHT PROJECTED THROUGH THE ASSOCIATED TRANSPARENCY, A SECOND INCLINED MIRROR FACING ONE OF SAID PAIR OF MIRRORS, A PRISM ASSEMBLY IN THE PATH OF THE LIGHT REFLECTED FROM THE OTHER MIRROR OF SAID PAIR AND
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