[Solved] out of the following methods ,one is method used flame hardening process?

Mechanical Engineering
Engineering Metallurgy
out of the following methods ,one is met...

Q.	out of the following methods ,one is method used flame hardening process?
A.	stationary method
B.	circular and progressive method
C.	spiral and progressive method
D.	all of the above
Answer» D. all of the above

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