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Dear Sir or Madam, Please send us an price for machine that listed details at below. Best regards. Machine type: Digital input Manufacturer: Siemens Model: Simatic S7 6ES7 421-1BL00-0AA0 https://www.usedsecondhand.com/control-units/siemens-simatic-s7-6es7-421-1bl00-0aa0-digital-input.html I am a dealer