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Устройство для извлечения из кости полого металлического гвоздя / Н. Я. Прокопьев, А. Н. Прокопьев — <URL:http://www.fips.ru/Archive/PAT/2007FULL/2007.01.10/DOC/RUNWU1/000/000/000/059/964/document.pdf>.
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