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Contact Us Sales manager: Mac Xie Mobile: +8618020714662(WhatsApp) Email: at@mooreplc.com Skype: +8618020714662 Contact Us ✭Product Overview✭ SIMATIC S7-400, SM 421 DIGITAL INPUT MODULE, OPTIC. ISOLATED, 32 DI, 24V DC Siemens 6ES7 421-1BL
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