首页>
外国专利>
Improved System of Electric Signals for Main and Tail Haulage in Mines and like Places.
Improved System of Electric Signals for Main and Tail Haulage in Mines and like Places.
展开▼
机译:矿山及类似场所的主拖尾牵引电信号改进系统。
展开▼
页面导航
摘要
著录项
相似文献
摘要
13,310. Burrows, G. B. May 30. Drawings to Specification. Indicating ringing of bells to operators.-A lamp placed across an impedance at the ringing station is employed to indicate the operation of the bell at the receiving station.
展开▼