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Disks soiling indicator with a spotted disks on the surface through the window and a light source emits light by the lens contamination of the changes caused by the window light remitted light be registered measuring device and connected thereto signal transmitter
Disks soiling indicator with a spotted disks on the surface through the window and a light source emits light by the lens contamination of the changes caused by the window light remitted light be registered measuring device and connected thereto signal transmitter
