Computer Science · Computer History and Development
17वीं शताब्दी में ब्लेज़ पास्कल द्वारा आविष्कृत कौन सा यांत्रिक उपकरण विशेष रूप से गियर का उपयोग करके सीधे जोड़ और घटाव करने के लिए डिज़ाइन किया गया था?
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