Nippon LR capacitor

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I am in the process of replacing all the electrolytics in a Denon PMA-737, from 1984, and in the phonestage is a orange polarized cap with the text 10uf 50v LR. It is 15*6 mm and closed with epoxy instead of the usual rubber.
Brand Nippon Chemicon.
Do any of you guys know what is special about it? And what the LR means?
 
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