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... depending on the grades. The Carbon Steel Seamless Pipe material therefore is stronger and is highly stress resistant.There are seam steel pipes, there will be a welded straight line, or the surface is poli...
...straight-line distance: 10-15 meters 4. Horn: φ thirteen 5. Battery: Polymer lithium battery, earphone 30mah, charging compartment 280mah 6. Playback time: 5-6 hours 7. Standby time: approximately 100 hours ...