Ise Pandubbi Se Dekhne Ke Liye Kis Upakarann Ka Upyog Kiya Jata Hai ? इसे पनडुब्बी से देखने के लिए किस उपकरण का उपयोग किया जाता है ?

इसे पनडुब्बी से देखने के लिए किस उपकरण का उपयोग किया जाता है ?

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