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When was the process, Photochemical milling is introduced to the machining environment?

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When was the process, Photochemical milling is introduced to the machining environment?

(a) 1920s

(b) 1930s

(c) 1950s

(d) 1960s

The question was posed to me in examination.

I need to ask this question from Photo Chemical Millling-Introduction in chapter Chemical Processes of Advanced Machining

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Best answer
Right answer is (d) 1960s

For explanation: PCM was introduced to the machining industry in 1960s, as an offshoot of PCBs.

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