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Priority to JP1973032170UpriorityCriticalpatent/JPS5322381Y2/ja
Publication of JPS49132890UpublicationCriticalpatent/JPS49132890U/ja
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Publication of JPS5322381Y2publicationCriticalpatent/JPS5322381Y2/ja
Optical measuring apparatus for sampling material, making a flame test, and comparing the light from an unknown concentration with that from two known concentrations