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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7459303 | Impedance based apparatuses and methods for analyzing cells and particles A device for monitoring the migration or invasion of a biological particle such as a cell is disclosed. The device includes an upper chamber adapted to receive and retain a cell sample, a lower chamber having at least two electrodes, and a biocompatible porous membr... | 12/02/2008 |
| 7011485 | Tiltable hand truck The present invention provides an improved hand truck having a tiltable platform for carrying heavy objects, which is safe to use and easily maneuverable, and requires the minimum amount of energy required for movement of heavy objects. The present invention provide... | 03/14/2006 |
