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Color filter array for machine vision system |
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Uniform illumination of keys |
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2018-06-12 |
| 9971084 |
Illumination structure for uniform illumination of keys |
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Optical device using echelle grating that provides total internal reflection of light |
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| 9348099 |
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| 9250388 |
Optical device using echelle grating that provides total internal reflection of light |
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