Science · Physics
बॉल पॉइंट पेन का पहला पेटेंट (आविष्कार) कराने का श्रेय किसे दिया जाता है?
- 1गैलीलियो गैलीली
- 2लुईस वॉटरमैन
- 3लास्ज़लो बीरो
- 4जॉन जे. लाउड✓
सही उत्तर देखें
जॉन जे. लाउड
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