from The Century Dictionary and Cyclopedia
- n. A form of socket-wrench having a T-head, or other shape resembling the winding-key of a clock, which fits the squared or prismatic shape on the end of a valve spindle. It is designed for use where the valve should not be opened or shut except by one duly authorized and possessing such a key or wrench.
- n. A key fitting the lock which is on the casing surrounding a safety-valve or other valve, and by which tampering with the valve is prevented.
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