जॉन लोजी बेर्ड किसके अविष्कारक थे?
A.ट्रॅन्सफॉर्मर
B.टेलिस्कोप
C.ट्रॅनसिस्टर
D.टेलीविज़न (मेकॅनिकल )
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I think its d television( mechanical )
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