PREVIEW
... ted on May 15, 1960, which coincides with the 42nd anniversary of the Qidian Chinese Website.
However, the formal application of laser engraving technology came more than a decade after the invention of lasers, requiring a certain level of industrialization to master such technological means.
The simplest local laser engravings can be traced back to the late 1970s.
Of course.
Considering that there might be some abnormality in that alternative technological tree, ...
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