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When was the first significant development of ECM occurred?

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When was the first significant development of ECM occurred?

(a) 1920s

(b) 1930s

(c) 1950s

(d) 1960s

I had been asked this question in exam.

Asked question is from Electro Chemical Machining-Introduction and Principle of electrolysis topic in chapter Electrochemical Processes of Advanced Machining

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The correct option is (c) 1950s

Easiest explanation: After the first patent in 1929, the first development of ECM was done in 1950s.

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