proof-plug
noun
A plug used to close the breech of a gun barrel while it is being proved.
Origin
Late 19th century; earliest use found in Edward H. Knight (1824–1883), patent lawyer and expert in mechanics.
| 单词 | proof-plug |
| 释义 | proof-plugnoun A plug used to close the breech of a gun barrel while it is being proved. Origin |
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