police

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police

টেলিফোনের ইতিহাস

মোবাইলের ব্যাবহারে টেলিফোন চাহিদা কমে গেলেও এর গুরুত্ব অনেক। আলেকজেনডার গ্রাহাম বেল ১৮৭০ সালে টেলিফোন আবিষ্কার করেন। এটি আবিষ্কারের পিছনে ছি...

Kalyan Panja ৩১ ডিসে, ২০১২

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