But it was Durgapur 's poor record that greatly lowered the overall efficiency level for HSL plants . लेकिन यह दुर्गापुर का खराब रिकार्ड था जिसके कारण एच.एस.एल . संयंत्रों की पूर्ण क्षमता को काफी कम कर दिया .
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