DK77349C -
Electric discharge tube with a luminescent material and method of making luminescent material suitable for use in the discharge tube.
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Electric discharge tube with a luminescent material and method of making luminescent material suitable for use in the discharge tube.
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DK9250A1949-01-141950-01-11
Electric discharge tube with a luminescent material and method of making luminescent material suitable for use in the discharge tube.
DK77349C
(en)