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2000w 20k Welding Ultrasonic Transducer for Making Three layers Mask FS(hz): 19841.6 F1(HZ): 19837.6 F2-F1(HZ):7.2 QM: 2746.39 CT(NF): 11.06825 R1(ohm):9.11 Keff: 0.14 Type length(mm) Joint Bolt(mm) ...