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Overhead projector with a lens head supported by a foldable column
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Overhead projector for transmitted light projection without distortion with focus compensation
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Projection lamp life indicator
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Device for fastening a lamp in a lamp housing of a projector
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Collapsible picture-projector - has opening in housing underside shut by mirror in transport position also hinging distance-pieces with supports
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Working projector
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LIQUID CRYSTAL CELL ARRANGEMENT
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Hand drive for microfilm reading device
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Microfilm projector
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Pull-in device for microfilm cassettes
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Microfilm projector
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Housing for an electrically operated apparatus, especially a picture-screen apparatus
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Microfilm projector
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Microfilm projector
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Device for successively scanning individual frames by means of a television camera
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Scattered light shielding of a projector for projecting images
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Fine focus for overhead projector or enlarger - has lever running in spiral groove to operate axial drive for condenser lens
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Overhead projector
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Overhead projector with writing surface on base - has column to support mirror and lens with slide projector mounted above as independent unit
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Projector lamp supply circuit - has HF transformer transistor oscillator to supply LV lamp
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