| 摘要 |
PROBLEM TO BE SOLVED: To enhance the contact use efficiency of a relay used in a railway signal protective device such as a relay interlocking device. SOLUTION: A plurality of electromagnets are provided on a substrate which is attachably/detachably fitted to a jack plate, and a plurality of contact groups which are operated corresponding to the drive of each electromagnet are also provided thereon. COPYRIGHT: (C)2003,JPO
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