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retractable blade

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1
Why was bloodletting so popular? - Stephanie Honchell Smith
when the spring lancet was invented, with its tough-to-clean retractable blade.
medicine
трудно очищаемое выдвижное лезвие
Лезвие, которое трудно чистить и которое можно убрать внутрь инструмента.
Why was bloodletting so popular? - Stephanie Honchell Smith
C1-C2
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