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

Name: 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
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Question

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The Answer is D

Out of the Following Methods ,One Is Method Used Flame