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When the Plasma Beam machining process came into the industrial world?(a) 1920s(b) 1930s(c) 1950s(d) 1970sThe question was asked in unit test.My enquiry is from Plasma Beam Machining-Introduction And Machining system topic in section Thermal Processes of Advanced Machining |
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Answer» The correct choice is (c) 1950s |
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