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- PATENT 2,530,139. SHEET 2 OF 2.
- PATENT 2,530,139. 2 SHEETS-SHEET 1.
- Page 6.
- Page 5.
- Page 4.
- Page 3.
- Page 2. Hydraulic governor history.
- Page 1 of Rufus Oldenburger's engine governor patent.
- Patent 3,051,138. 2 sheets-sheet2.
- Patent 3,051,138. Sheet 1 of 2. Hydraulic governors.
- From the vintage advertisement collection.
- A vintage Caterpillar Company advertisement.
- NEW WORK HABITS. 5.
- NEW WORK HABITS. 4.
- NEW WORK HABITS. 3.