Physics · Important Discoveries in Physics
कैलोटाइप प्रक्रिया (Calotype process) का आविष्कार किसने किया था, जिसने कागज पर बुनियादी नेगेटिव-पॉजिटिव फोटोग्राफिक तकनीक स्थापित की थी?
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