Tswj txee
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Monarch Control Txee yog tsim rau Traction of elevator
1. Tshuab chav of elevator tswj txee
2. Tshuab chav-tsawg of elevator tswj txee
3. Traction hom tsev of elevator tswj txee
4. lub zog-txuag tawm tswv yim ntaus ntawv