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First Claim
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1. A CATHODE RAY DEVICE HAVING AN IMAGE SCREEN COMPRISING M'"'"''"'"'2O, AL2O3, SIO2, AND MX WHERE M AND M'"'"''"'"' STAND FOR AN ALKALI METAL AND X IS A HALOGEN.
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2 Claims
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1. A CATHODE RAY DEVICE HAVING AN IMAGE SCREEN COMPRISING M'"'"''"'"'2O, AL2O3, SIO2, AND MX WHERE M AND M'"'"''"'"' STAND FOR AN ALKALI METAL AND X IS A HALOGEN.
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2. A CATHODE RAY DEVICE HAVING AN IMAGE SCREEN OF NATURAL HACKMANITE.
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