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The Proportional Governor Patent Number 2,474,140.

C6.jpg Patent number 2,474,140. Sheet 3.ThumbnailsPatent number 2,474,140. Sheet 4.Patent number 2,474,140. Sheet 3.ThumbnailsPatent number 2,474,140. Sheet 4.Patent number 2,474,140. Sheet 3.ThumbnailsPatent number 2,474,140. Sheet 4.Patent number 2,474,140. Sheet 3.ThumbnailsPatent number 2,474,140. Sheet 4.

Circa 1939.