Interference filters
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Article
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1971
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Elsevier Science
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English
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## Optical filters Patent 1 206 260 granted to A. P. Predrick. (Oct. 23, 1969) A wavelength selective light screen permitting the passage of blue-violet light, but not red light, comprises a thin perforated sheet sandwiched between strengthening sheets. Beam splitter Patent 1 206 461 granted to E