disc signal
(US disk signal) Railways (now chiefly historical )
noun
Any of various types of signal in the form of a disc or displaying a disc.
Origin
Mid 19th century; earliest use found in Railways.
| 单词 | disc signal |
| 释义 | disc signal(US disk signal) Railways (now chiefly historical ) noun Any of various types of signal in the form of a disc or displaying a disc. Origin |
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