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Method for the preparation of CdS or CdSe powder for electrophotography
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Photorecording process and photorecording member
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Recording member of photocolor developing and eliminating material and the recording method
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Drive mechanism for copying machine
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Electrophotographic plate
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Method of producing a photo-conductive cell
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Light-stable erasable copies prodn - in photochromic coats of spiropyran in non-polar binder
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Imagewise photochromic process utilizing spiropyran compounds and halogenated hydrocarbon photoactivators
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Apparatus for electrostatic image-forming and processes for use therewith
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Developers for electrical latent images contng a dye
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Original holder reciprocating-type driving device for photocopying machine
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Photoelectric and electric light conversion element
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Electrophotographic charging apparatus comprising needle point discharge electrodes and concave shield electrodes
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Pentaprism for single lens reflex camera
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Corona discharging device for electrophotographic process
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Improved Electrophotographic Plate
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Electrophotographic process
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Hot stamping leaf for concealing indicia and method of using
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Photoconductive cell
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Improved electrophotographic process
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