An Automatic Detacher or Automatic Take-off is a device for sensing the end of milk flow in the milking machine which shuts of the milking vacuum and releases the milking machine from the cow's udder.

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Other /More definition:
An Automatic Detacher or Automatic Take-off is a device for sensing the end of milk flow in the milking machine which shuts of the milking vacuum and releases the milking machine from the cow's udder.