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Priority to JP5444473ApriorityCriticalpatent/JPS5732488B2/ja
Publication of JPS502174ApublicationCriticalpatent/JPS502174A/ja
Publication of JPS5732488B2publicationCriticalpatent/JPS5732488B2/ja
Lens system having predetermined focusing power in different mediums, such as air and water, for providing a close up lens which may be attached to a camera either in air or underwater