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When did the Electron beam machining come into the machining industry?

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in Advanced Machining by (962k points)
When did the Electron beam machining come into the machining industry?

(a) 1920s

(b) 1930s

(c) 1950s

(d) 1960s

The question was posed to me by my college professor while I was bunking the class.

The doubt is from Electronbeam Machining-Introduction, Equipment and Material removal in division Thermal Processes of Advanced Machining

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Right answer is (d) 1960s

The best explanation: The Electron beam machining was introduced to the machining industry in the early 1960s.

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