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| Patents for Ludwig Hailer | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 278,907 | Jun. 05, 1883 | A.H. Emery | Pressure-gage | |
 | 278,908 | Jun. 05, 1883 | A.H. Emery | Pressure-gage | |
 | 278,909 | Jun. 05, 1883 | A.H. Emery | Pressure and vacuum gage | |
 | 278,910 | Jun. 05, 1883 | A.H. Emery | Pressure-gage | |