Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6344700 | Redundant electrical DC power system for aircraft A DC electrical power generation system for aircraft having primary and emergency generation systems is disclosed. The system includes a transmission driven power generator, a dedicated generator control unit and a distribution network for providing suffi... | 02/05/2002 |