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3951524 Projection lens system for motion picture projector  
A projection lens system comprises a positive meniscus lens G1 (as numbered consecutively from front to rear) convex to the front, a biconcave lens G2, a biconvex lens G3, a positive meniscus lens...
3800085 CONVERTIBLE DIRECT VIEWING/PROJECTION T-V SYSTEM  
A converter attachable to a standard television set whereby the set, when the converter is disconnected, may be directly viewed in the usual manner, but when the converter is operating, functions...
3552832 OPTICAL PROFILE PROJECTION SYSTEMS