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Vol 146
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Research article
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Use of laser directional signs in St. Petersburg subway construction

M. V. Dolgikh1
A. N. Sheremet2
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  • 1 — Saint Petersburg Mining University
  • 2 — Санкт-Петербургский горный ин-т
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The history of an introduction of the laser of direction is described at building undergrount of city, and also the characteristic of a modern park of the laser of direction and problem of usage them for today is given.

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