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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 6438412 | Memory loop ECG recorder with continuous recording An ECG recorder is provided that includes a processor configured to perform the ECG data sampling routine while performing additional routines, such as transmitting stored ECG events and setting user preferences. Accordingly, a patient's ECG signal is con... | 08/20/2002 |
| 6023418 | Low voltage polarity correcting DC to DC converter A DC to DC converter particularly suited for use to boost or reduce the voltage with single battery systems allows insertion of the battery in either polarity through use of a symmetrical arrangement of solid-state switches which alternate charging an ind... | 02/08/2000 |
| 5431575 | Bi-directional battery holder A battery holder for axial-type dry cells, alkaline or other, has opposed faces for abutting either terminal of the battery and supporting two conductors, a center conductor contacting only the positive terminal of the battery and a flanking outer conduct... | 07/11/1995 |
| 5153584 | Miniature multilead biotelemetry and patient location system A miniature multi-lead bio-telemetry and patient location systems includes one or more stationary location markers which transmit location data to an ECG unit worn by ambulatory patients. The electrocardiogram (ECG) unit monitors patient ECG data, a distr... | 10/06/1992 |
