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There is a page named "File:Air and Water Pump Indicator Diagram, 1869.jpg" on Wikipedia
- DescriptionAir and Water Pump Indicator Diagram, 1869.jpg English: Air and Water Pump Indicator Diagram, 1869 Date 1869 Source The indicator diagram practically...(1,030 × 837 (99 KB)) - 04:58, 26 July 2023