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accommodate Aids to Learning American Library Association American Standards Association angle aperture apparatus Argus Bausch and Lomb chine Colby College Committee on Scientific condenser Corporation cost described designed desk Documat documentary reproduction enlargement equipment Erban Model Evaluations and Standards eyestrain film gate film strips flats focus focusing frame Fussler glass plates Griscombe ground glass heat Holbrook illumination inexpensive Iterson Journal of documentary knob Kodagraph Kodak lamp Leica Leitz lenses light source Litchfield and Bennett magnification manufactured marketed material mechanism Memex micro micro-images Micro-Master Micro-News Reader micro-opaques Microcard Microfilm Reader Microphotography Microprint Microtronics Microvist mirror opaque screen optical Paul Otlet photographic portable reading projected the image Ralph Raney Reader Model Readex reading devices reading machine Recordak Model reels Remington Rand Research rolls rotating scanning Scientific Aids Seidell's sheet film slide Spencer Lens tion translucent screen transparencies UNESCO Vernon Tate viewer wall projector watt Zeiss-Ikon