U.S. federal trademark · Serial No. 88222155 · Reg. No. 20495940
[ Micrometer gauges; level gauges; depth gauges; computer-controlled apparatus for measuring radio frequency signals, concentrations of gas and liquids, and audio signals; pressure indicators; temperature indicators; barometers; scientific measuring instruments, namely, conductivity meters; electrical energy utilization metering devices; water testing instrumentation for detecting contamination degree; ] surveying machines and instruments for testing the pollution level of water, namely, water testing instrumentations for monitoring and detecting contamination
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