The preceding difficulties led to the development of chemical, electrical, laser, and high-energy…

The
preceding difficulties led to the development of chemical, electrical, laser,
and high-energy beams as energy sources for removing material from metallic or
nonmetallic work pieces, as outlined. These advanced methods, which in the past
have been called nontraditional or unconventional machining, began to be
introduced in the 1940s.

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