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Quiet performance: Polyurethane steel wire core synchronous belt has good shock absorption and noise reduction performance
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摇动立柱手柄，当红点重合时，即为焦距。
Anti-Resonance
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Hunst China CO2 ZnSe Focus Lens Dia.12 18 19.05 20mm FL38.1 50.8 63.5mm for Laser Engraving Cutting Machine Spare Parts $100 - $400 Quiet performance: Polyurethane steel wireHigh quality ZnSe crystal: China PVD ZnSe material, Excellent optical properties, Up to 200W CO2 laser resistance. Superb coating process: Double sided solid coating, reduces laser loss, laser transmittance up to 99. 8%High precision process: Eccellent substrate Precise sling, polishing grinding processes, high temperature, laser resistance. 1. Use an air bulb to blow off any loose contaminants.(dust,lint particles) 2. Squeeze a few drops of acetone
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