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When was Abrasive water jet machining developed first?

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in Advanced Machining by (962k points)
When was Abrasive water jet machining developed first?

(a) 1942

(b) 1958

(c) 1974

(d) 1980

I have been asked this question by my school teacher while I was bunking the class.

This intriguing question comes from Abrasive Water Jet Machining in chapter Mechanical Processes of Advanced Machining

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The correct choice is (c) 1974

For explanation I would say: Abrasive water jet machining was first developed in the year 1974.

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