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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4565201 | Signal processing apparatus and high resolution electrocardiograph equipment including same Signal processing apparatus particularly useful in electrocardiograph equipment comprises a conventional ECG amplifier channel, a high-gain ECG amplifier channel, signal averaging means, and a control panel enabling the manual selection, for inputting int... | 01/21/1986 |
