TREA

Optical projection devices wherein the contrast is controlled electrically (

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Industry

  • CPC
  • G03B27/725
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Parent Industries

GPHYSICS G03Photography G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES ACCESSORIES THEREFOR G03B27/00Photographic printing apparatus

Current Industry

G03B27/725Optical projection devices wherein the contrast is controlled electrically (
Industries