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| Patents for Diaphone Signal Co. | |||||
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| Number | Title | Classification(s) | |||
| NF-1,904,001 | Sound producing devices for syrens and like instruments | ||||
| NF-1,906,027 | Improvements in sound producing devices, suitable for syrens and like instruments | ||||
| NF-1,911,014 | Sound producing devices for fog signalling, position locating, and the like | ||||