defence exam CISF Constable Tradesman 2025 Mock Test General Knowledge Science Technology and Inventions

मोबाईल फोनचा शोध कोणी लावला?

1
मार्टिन कूपर
2
विलिस कॅरियर
3
चार्ल्स एच. टाउन्स
4
जॉन नेपियर
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