jayrandom: (Default)
jayrandom ([personal profile] jayrandom) wrote2012-07-27 10:47 pm
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как просверлить квадратную дырку?

Как просверлить квадратную дырку?

Разумеется, треугольным сверлом.

На практике вращают не сверло, а деталь. Но суть та же.
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