जॉर्ज वेस्टिंगहाउस ने क्य� – McqOptions

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1.	जॉर्ज वेस्टिंगहाउस ने क्या आविष्कार किया?
A.	लाइट बल्ब
B.	विद्युत उस्तरा
C.	फ्रिज
D.	रेलवे के एयर ब्रेक
Answer» E.

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