4. Optics: image projectors
  5. Miscellaneous

Peter H. Grunwald

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Apparatus for wireless transmission of a teaching program in a c

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
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Overhead projector

Optics: image projectors – Miscellaneous
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Overhead projector

Optics: image projectors – Miscellaneous
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Overhead projector

Optics: image projectors – Episcope – Reflector between lamp and screen
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Overhead projector

Optics: image projectors – Temperature control – Blower
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Profile ID: LFUS-PAI-P-200409

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