Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6207256 | Space truss composite panel A space truss composite panel is excellent in structural mechanics and capable of being efficiently and economically produced. The space truss composite panel has a construction in which a sheet 1 provided with a series of slits 2 is formed into a space f... | 03/27/2001 |