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When was the process Electro polishing introduced to the advanced machining processes?

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When was the process Electro polishing introduced to the advanced machining processes?

(a) 1918

(b) 1922

(c) 1935

(d) 1943

This question was addressed to me during an interview.

My enquiry is from Electro Polishing-Introduction topic in portion Chemical Processes of Advanced Machining

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Correct option is (c) 1935

Best explanation: Electropolishing was introduced to world in the year 1935, when Cu and Zn were successfully electropolished by Germans.

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