A specialized brush or tool designed to clean and maintain file tools by removing accumulated metal particles and debris.
Compound word from 'file' (the tool) and 'card' (a tool with bristles). The term developed in workshops and manufacturing contexts where file maintenance was essential.
A filecard is one of those brilliant simple tools—it's basically a brush with wire bristles, and every machinist and carpenter who uses files has owned one, yet almost nobody knows its name.
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