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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7332344 | Luminescence assays A method of detecting an analyte is described in which an up-converting luminescent species that is excited by absorption of long wavelength light is provided as a donor of energy to an acceptor species that can be bound to, or generated in proximity to, the lumines... | 02/19/2008 |
