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This web page states the following, "We are professional PLC manufacturer in China." We saw that the web site also said " As a leading PLC Controller manufacturer, we take customers demands as the first element and attach great importance to innovative design, RD, production and sales of reliable industrial controlling products." The header had plc manufacturer as the highest ranking optimized keyword. It is followed by plc programmable logic controller, plc program logic controller, and programmable logic controller plc which isn't as ranked as highly as plc manufacturer. The next words sinoplc.com uses is programmable controller. programmable logical controllers was included and will not be seen by search crawlers.