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Source Siemens 6ES7972-0CB35-0XA0 SIMATIC S7, TS Adapter II for SIMATIC Teleservice RS-232 and integrated analog modem on m.alibaba.com
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6ES7 972-0ED00-0XA0 Siemens Simatic S7 TS-Adapter IE ISDN Teleservice RS-232 new 6ES79720ED000XA0 neu 4019169143332 TSA-IE ISDN 6ES7972-0ED00-0XA0 - Amazon.com
Siemens 6ES79720EA000XA0 IE Advanced IP Based TS Adapter, For Use With SIMATIC Teleservice and SIMATIC S7 Controller, 117 mm H x 55 mm W x 75 mm D (Mature Manufacturer Status)
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