A Special Cover to celebrate the Platinum Jubilee of CSIR - National Physical Laboratory was released on 4th January 2022 at New Delhi.
Courtesy: Sreejesh Krishnan, Thiruvananthapuram.
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A Special Cover to celebrate the Platinum Jubilee of CSIR - National Physical Laboratory was released on 4th January 2022 at New Delhi.
Courtesy: Sreejesh Krishnan, Thiruvananthapuram.
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