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- The Proportional Governor Patent Number 2,474,140.
- Patent number 2,474,140. Sheet 4.
- Patent number 2,474,140. Sheet 3.
- Patent number 2,474,140. Sheet 2
- Patent number 2,474,140.
- Patent number 2,474,140. Page 4.
- Patent number 2,474,140. Page 3.
- Patent number 2,474,140. Page 2.
- Patent number 2,474,140. Page 1.
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