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| All Patents in class 340/392.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,164 | Jun. 19, 1847 | U.C. Hill, C.F. Hill | "Hilleno" | musical instruments | |
| 1,312,610 | Aug. 12, 1919 | P.E. Chapman, R.H. Robinson | Variably pitched and actuated bell | fire alarms | |