| 摘要 |
An automatic signaling system to prevent a tractor from being accidently lifted with the cargo by a ship to shore gantry crane. The embodiment includes multiple sensors to detect a lifted condition and radio output upon a lifted condition. The radio output channel is determined by an automatic identification system that identifies the crane the tractor is under. Upon receiving a lifted signal the cranes hoist will be stopped and disabled but will still allow lowering until the lifted signal stops.
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