The paper gives solutions to the problems with lighting circuit of permissive aspect of block signal of existing automatic block section according to relevant specifications.

通过对现有自动闭塞区间通过信号机容许信号点灯电路存在问题的分析，根据相关规范，提出解决办法。

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Hundreds of thousands of low-quality patents had been approved under the permissive rules the Federal Circuit had developed during the 1990s.

FORBES: Specialist Patent Courts Are Part Of The Problem