Sometimes the drills, especially in the already served, without distinction, the marking indicating the diameter. It would seem that to define it is only possible with a micrometer. But here’s a simple and fairly accurate method of measurement with… grip. Drill clamped in their jaws, and remaining between them a gap corresponding to the diameter of the already available ordinary ruler with millimeter divisions.
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In accordance with the existing plan for the construction of the Soviet Navy in the late 1950-ies provided for the construction of a series of special vehicles, air defense PR 1126 ships...
