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Multiple measuring device
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Electric light meter with element built into the cover
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Photoelectric light meter with swiveling measuring range aperture
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Photoelectric light meter
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Photoelectric light meter
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Photoelectric light meter
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Photoelectric light meter
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Ever-ready case for a photoelectric light meter
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Registering measuring device
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Spring holder for moving coil devices with inner tip storage and zero point adjustment
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Scale window for measuring devices
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