सेफ्टी लैम्प के आविष्कारक – McqOptions

MCQOPTIONS

1.	सेफ्टी लैम्प के आविष्कारक है ?
A.	मार्कोनी
B.	डेवी
C.	शोल्स
D.	रोंटजन
Answer» C. शोल्स

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