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| Patents for Ludwig J. Grauel | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,908,258 | Oct. 13, 1959 | L.J. Grauel, C.H. Schowalter | Fuel Control Mechanism for Diesel Engines | ||
| 2,927,569 | Mar. 08, 1960 | L.J. Grauel | Engine Air Supply Control | ||
| 2,987,055 | Jun. 06, 1961 | C.E. Nilson, L.J. Grauel | Combustion Air Supply Control for Internal Combustion Engines | ||