File:'Klinger' boiler water-level gauge (Army Service Corps Training, Mechanical Transport, 1911).jpg
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![File:'Klinger' boiler water-level gauge (Army Service Corps Training, Mechanical Transport, 1911).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/%27Klinger%27_boiler_water-level_gauge_%28Army_Service_Corps_Training%2C_Mechanical_Transport%2C_1911%29.jpg/469px-%27Klinger%27_boiler_water-level_gauge_%28Army_Service_Corps_Training%2C_Mechanical_Transport%2C_1911%29.jpg?20100608161746)
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