Notes
स्लाइड रूल का आविष्कार 1621 ई0 में हआ था।
स्लाइड रूल का आविष्कार 1621 ई0 में हआ था।
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Hinglish Excerpt
Slide rule ka Avishkar 1621 eesvi mein hua tha.
Tags: 1621 ई०आविष्कारस्लाइड रूल
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