General Knowledge · Inventions and Inventors
1837 में 'स्टैनोग्राफिक साउंड हैंड' के रूप में प्रकाशित व्यापक रूप से उपयोग की जाने वाली ध्वन्यात्मक शॉर्टहैंड (आशुलिपि) प्रणाली का विकास किसने किया था?
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