при совпадении
• With the 0 of the vernier and the 0 of the graduated column coincident (or When ... coincide), the vernier hook can be made to ...
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Русско-английский научно-технический словарь
на Gufo.me
• With the 0 of the vernier and the 0 of the graduated column coincident (or When ... coincide), the vernier hook can be made to ...