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| All Patents of Type: magnetic transducers | |||||
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| Number | Date | Patentee | Title | Type | |
| 299,552 | Jun. 03, 1884 | W.S. Johnson | Electro-Magnetic Indicator | magnetic transducers | |
| 2,891,115 | Jun. 16, 1959 | J.W. Hogan | Magnetic Transducer | magnetic transducers | |