This is a listing for a Partlow MRC 7000 Circular Chart Recorder Model 710000000021 This includes the following: Partlow MRC 7000 Circular Chart Recorder Model 710000000021 Description: This is a Partlow MRC 7000 Circular Chart Recorder Model 710000000021. There
I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
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