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one-way head /ˌɒnˈɒf ˈslaʃ ˈvɒljuːm/ n

中文：单向槽头

中文 · 单向槽头Español · tornillo de un solo sentidoFrançais · tête à sens unique
Meaning：Slotted head having two opposing quarters removed so that the screw can be turned one way only, making it very difficult to unscrew.
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Found in these illustrated scenes（2）

Screw head types Nail head example

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